Malicious PDF — malware analysis report

Static analysis result for SHA-256 562a918e772ca2c8…

MALICIOUS

PDF

84.0 KB Created: 2021-05-19 23:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 93b6a405159386487e585dbf6684337d SHA-1: 3d8a0b0485f44730fce1446949bf643884e20634 SHA-256: 562a918e772ca2c8faf3e8cfab48d2fd58849210cb9a9cb9293f3452f7dfa314
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/strik?utm_term=go-toubun+no+hanayome+cap+6+sub+espa%25C3%25B1ol PDF link annotation
    • https://pozufijuxib.weebly.com/uploads/1/3/0/7/130775557/fikidepelorosagali.pdfIn PDF document text
    • https://wugupuvexiso.weebly.com/uploads/1/3/0/9/130969254/b070a.pdfIn PDF document text
    • https://junurewumopu.weebly.com/uploads/1/3/2/7/132740614/f5a7f6683ad992.pdfIn PDF document text
    • https://sajofagexureleb.weebly.com/uploads/1/3/4/6/134652103/8110938.pdfIn PDF document text
    • https://wevetajapejo.weebly.com/uploads/1/3/4/6/134636724/kerituzepafalew.pdfIn PDF document text
    • https://pofekabebo.weebly.com/uploads/1/3/0/7/130739116/5054144.pdfIn PDF document text
    • https://polerobozugewif.weebly.com/uploads/1/3/4/3/134344868/6137440.pdfIn PDF document text
    • https://bipawekiramobaz.weebly.com/uploads/1/3/5/3/135325031/mulilazajugut-tekisenele.pdfIn PDF document text
    • https://lovefuzabuzonif.weebly.com/uploads/1/3/4/1/134109130/jijevixifa_sagajusorubo.pdfIn PDF document text
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/2637187.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8ea08b4c-873d-4c9d-9262-66b97e4c9be0/death_note_light_yagami_becomes_a_shinigami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c528d2eb-f02e-43fe-a636-024dbd746dde/82595668437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a98956-2832-488d-bfe0-cee09e45f2f2/kofuwawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e60650c4-4faa-4443-bba2-ea0e06244d94/how_to_make_mexican_peasant_dress.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93531ab7-20d8-473c-8bca-192b2bc72295/factory_reset_wndr3700_v2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16f78905-afdf-4985-b553-332ea6c65ceb/acer_gn246hl_black_24_1ms_144hz_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a06c30a-3bba-4383-9225-d5bb0785d7ec/74950514283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b486f54b-db4c-41ad-9ef6-618a53545af7/93834373614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33315b1f-de90-4c4f-baf2-f2811f2935fe/litomubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed263b28-6b6d-4113-bec3-cbe564f69da8/how_to_live_calm_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ac18a1b-d43e-4add-99a3-e44512800588/kokatilidugejarum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c387e07-fde4-404c-9c02-7c0256a78317/seth_godin_quotes_on_leadership.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/279b9f6f-ccc2-420a-9b54-c24ee7a51efd/mcgraw_hill_reading_wonders_2nd_grade_high_frequency_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aecbdb18-d1b3-4348-9089-5946b06511b2/where_to_buy_a_ds_lite.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F9 4144 bytes
SHA-256: c440dde85cf36a0e6239f509760f53bd5b544aa6b287f3b6bbe6266c5ab8668c
font_01_sfnt_off0000e56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56C 5584 bytes
SHA-256: f41605184fe524e7dbbbbeff241000264bbde1f2ef4570b54858d8ef6620c2f3
font_02_sfnt_off0000f80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80B 11012 bytes
SHA-256: 888be3f5fe514a54376acd2aeae14a106253faf88a29fc2fb971e24dd0424746
font_03_sfnt_off00011c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C64 16216 bytes
SHA-256: 752dd6585c143e05a930bc4a1a90f7731b68b8daa88498dea31248282ab385f7
font_04_sfnt_off0001315e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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