Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c7f9a0a402c109…

MALICIOUS

PDF

74.8 KB Created: 2021-03-20 00:37:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 72ac512347112bb5f89427aa14af638b SHA-1: afb1aa8a371ae9036de7d95886d03946ff9de9af SHA-256: 91c7f9a0a402c109bc1afacca5900d6d43984c57806f6fd6f5dc5c5eec05455f
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 hosting, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/wix?keyword=little+tikes+totsports+t-ball+set+target PDF link annotation
    • http://fafesixokegigi.getenjoyment.net/velan_swing_check_valve.pdfIn PDF document text
    • http://takipibimaxubov.sportsontheweb.net/is_remington_700_adl_short_or_long_action.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/tebonakesawo.pdfIn PDF document text
    • http://muritolovaj.iblogger.org/78285655951.pdfIn PDF document text
    • http://tejovotemikodes.getenjoyment.net/agilmente_libro_descargar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://728bf1be-24e3-4891-ba98-fedceca1a503.filesusr.com/ugd/3268c8_6027794b5abc4fa18be46cfe589d56ff.pdf?index=trueIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/what_does_29_mean_in_cribbage.pdfIn PDF document text
    • http://papilumovojulez.epizy.com/xaravibedokimilisunofow.pdfIn PDF document text
    • http://gaxopuna.epizy.com/46915432595.pdfIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_3834ead9c56b44789184c0fc904ed55c.pdf?index=trueIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_2d97f71ffb5349d6b499b6a70615db55.pdf?index=trueIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_9efae6332b874a2f92541d49624aef17.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cb73660-2fe3-41bb-b916-19fcfb2d2470/ritilax.pdfIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_887a509e951545bc8109e0dde834b0c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/dabiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb2045dd-3f54-4dee-a068-9a9348aeea60/zurojaka.pdfIn PDF document text
    • http://mezanemuwagoso.rf.gd/howard_marks_book_the_most_important_thing.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/81882776983.pdfIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_a6c7a613296740099ec6607e28566c8d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/jasazadogugevapusiwane.pdfIn PDF document text
    • https://e24ff460-1725-4b9d-a7de-f8438c38fea0.filesusr.com/ugd/366850_452338bb869f47fdbc36d70bc1f91500.pdf?index=trueIn PDF document text
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_8b4555b7d9614fc28845134269387faa.pdf?index=trueIn PDF document text
    • https://f5f74d4f-f804-4d9b-9bfa-9964b2756261.filesusr.com/ugd/e389b3_147eeb00f40a48138fe37c74d9ce650c.pdf?index=trueIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_a7bb0efcb9e04ef3835f78d78e95da38.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 5164 bytes
SHA-256: c63c672177d151e7d3a1f33be6eb3901b2efdc1dd797b01c81717c2c9a77ad6b
font_01_sfnt_off0000f7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FE 10808 bytes
SHA-256: 368ecae6976c093975cef5bdadddd3f503f28e1c6259bcc6f09866f8cfd961c3

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