Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18b9a53c380dfe3…

MALICIOUS

PDF

79.5 KB Created: 2021-06-09 08:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6fe56a8ee649b72fb95acd4347a16795 SHA-1: 3ce71ad372b77a61f7c965b040147628aa1c21e1 SHA-256: b18b9a53c380dfe3a46c43eda5f8624c7a7e8d8a36cafb4c82c0e62ca63593d3
186 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to PDFs hosted on disposable or unknown domains, suggesting a link farm or SEO manipulation scheme. The presence of external URIs and the overall structure strongly suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crysiq.ru/pbw?utm_term=simple+present+tense+worksheets+for+grade+7+with+answers PDF link annotation
    • https://fosuzotarodaduv.weebly.com/uploads/1/3/4/3/134391180/wunusineva.pdfIn PDF document text
    • https://danulezide.weebly.com/uploads/1/3/4/6/134601395/bagatubuleru_nodusagix_giludiguvevujuk_mikasekowik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471230/normal_5ffc5ecbbfd31.pdfIn PDF document text
    • https://tumekisegazuf.weebly.com/uploads/1/3/4/6/134611428/vugonej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445754/normal_6061820643991.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406202/normal_602ee25f8ce3e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1494794-4c3d-43de-b3b2-b8bf111bd02a/dimuraladiduvijosovek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/679212a4-8400-4701-8a4c-977b413a0397/lochinvar_knight_boiler_problems.pdfIn PDF document text
    • http://famukaser.pbworks.com/f/viberunaxerem.pdfIn PDF document text
    • http://lifelekufa.pbworks.com/f/what_do_sagittarius_look_for_in_a_man.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bbc41fb-3fa6-4b28-9274-9038ff482bf8/turn_over_of_documents_letter_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cd6bf13-c0b3-4667-b997-afe91a64c8b5/8th_edition_40k_transport_rules.pdfIn PDF document text
    • http://kivotin.pbworks.com/w/file/fetch/144678198/parallel_vs._antiparallel_beta_pleated_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa5ea335-6ec5-46e1-8316-87411213165e/xuvotusunesizebob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34059ab5-f1d2-4d9b-b12b-8081d95999bb/rotafiz.pdfIn PDF document text
    • http://sukagafamo.pbworks.com/f/another_twilight_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d94c846b-7d28-47d3-9b96-d1b474c4cac9/how_do_i_connect_first_data_fd130_to_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ef862a1-e9e9-4db6-b1b6-756f69581170/55545417728.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/f/77323737996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d11ff025-58b7-4684-85d6-4b2abf783aa9/download_fl_studio_12_apk_obb.pdfIn PDF document text
    • http://kepigiwup.pbworks.com/w/file/fetch/144612933/pizizonujikumowabatoba.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29C 5792 bytes
SHA-256: b7b755e5412d0d28c5e061f9015a1e97ec7bc5a2d891c5631f572581983a6141
font_01_sfnt_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 10920 bytes
SHA-256: d67faec5366fbc1989f81e7e51f4e83f80521d0c712aa510a8f13e116932dc8b
font_02_sfnt_off00011bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF2 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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