Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ecde63db067160…

MALICIOUS

PDF

85.8 KB Created: 2021-04-09 23:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fc57b0bb0f54e783d639853142a83b14 SHA-1: 48f88fae572067febcd2b285c9431c851ef0e2fe SHA-256: e4ecde63db06716072b0999a8d327f00f25d55d5678c701807bd24446936b217
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content delivery attempt. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF structure itself are indicative of an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=breakfast+at+tiffany%2527s+song+album PDF link annotation
    • https://cdn.sqhk.co/vekuperik/ggfNtge/kit_for_dls_season_2021_dortmund.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/OjgfKja/civilization_revolution_2_trophy_guide.pdfIn PDF document text
    • https://vavawuzozut.weebly.com/uploads/1/3/1/1/131163550/6254001.pdfIn PDF document text
    • https://cdn.sqhk.co/xedogigiloli/hAhhdif/cowboy_boots_buy.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/hejfhjb/zuzeziniw.pdfIn PDF document text
    • https://dikekivex.weebly.com/uploads/1/3/0/7/130775400/zatulin-fofut-gisosoromijusel-sebajoxos.pdfIn PDF document text
    • https://cdn.sqhk.co/togareguko/Kggjdji/vudizejidagipesiraz.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://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_32783c5213d64b55834e0a79aedee3a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c243c10-a0d4-4614-978f-a86a41d3bad3/bigufegivomun.pdfIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_1a96d4bc116547fcadc8ef891c996d93.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/43eaae6b-d212-4f8d-aec1-98f0380c3e5a/personality_type_compatibility.pdfIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_2efb213452c74c298f862cde83d5bfda.pdf?index=trueIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_e5f9970d6f5b4304b710ddba332cbef7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39d843e0-4af5-4f61-9637-28d7717db746/3266966564.pdfIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_c2d0637a78c84e8a90b5f97d25d7f7e2.pdf?index=trueIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_fa1694ebffc24c5b9742e4ad655882fa.pdf?index=trueIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_58e92f5fdcef4a3dba9a20110fcc6b89.pdf?index=trueIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_51c0da2d26ae4faf903df1f6d6e9c7fc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a9030e0-ffb6-4338-9bc5-f60b460d6d8a/70986400478.pdfIn PDF document text
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_eda690c40eac4f8485a28f5ed1b12288.pdf?index=trueIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_50aae8d98a2f460fa633cc6c2e07671a.pdf?index=trueIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_b94390da7244467f93a90255d649cc5c.pdf?index=trueIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10119 5360 bytes
SHA-256: 4c761dbb5e4cf4c0f4516c5abd51cf762874ac3973c7291456f09b0399c72d16
font_01_sfnt_off00011352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11352 11380 bytes
SHA-256: b3852a044d881593031e1d4553444dcae9bf69477d0428982acd016beb097db8
font_02_sfnt_off00013a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A16 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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