Malicious PDF — malware analysis report

Static analysis result for SHA-256 98fa2ba324884e21…

MALICIOUS

PDF

93.7 KB Created: 2021-03-06 11:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0264a344a8f92b20cf491bdaaf3e76fd SHA-1: b45ca64230ce71fbb367620661e50b2a03e76303 SHA-256: 98fa2ba324884e216dfe0700b2a6fa0eb115b7e8aeb4b5f0f4dd9ef50fbd4ad2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute phishing content or malware. While no scripts were explicitly extracted, the nature of the link farm and the embedded URLs suggest a potential for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/123?utm_term=where+does+woman+hollering+creek+take+place PDF link annotation
    • https://cdn.sqhk.co/noremixujor/icigs0y/vakizejenaruzonolizidu.pdfIn PDF document text
    • https://cdn.sqhk.co/zoturisa/ahgjbyV/2419905257.pdfIn PDF document text
    • https://cdn.sqhk.co/figoveraboj/ZjgFIja/dominoes_classic_domino_tile_based_game_engine.pdfIn PDF document text
    • https://zozabamefopofa.weebly.com/uploads/1/3/4/2/134234868/3a377e832a5211.pdfIn PDF document text
    • https://mifopubulu.weebly.com/uploads/1/3/1/6/131637027/binomazutosibaxo.pdfIn PDF document text
    • https://pirikanupixiro.weebly.com/uploads/1/3/0/8/130873781/7794419.pdfIn PDF document text
    • https://nudegono.weebly.com/uploads/1/3/4/6/134682657/rawijusaruxege-bobefabib.pdfIn PDF document text
    • http://xolokukifimiv.sportsontheweb.net/43436571511.pdfIn PDF document text
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/b620862.pdfIn PDF document text
    • http://nanonewe.scienceontheweb.net/how_to_count_calories_eating_out.pdfIn PDF document text
    • https://wexivupesowapab.weebly.com/uploads/1/3/2/7/132712225/1671428.pdfIn PDF document text
    • https://gebezemimubitup.weebly.com/uploads/1/3/1/0/131070169/nasufekolul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lefemijip/yakuza_kiwami_missable_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/61710077928.pdfIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_2c84b97f0fe34b049a90a061ce2af45e.pdf?index=trueIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_2ff8b56c97d04e11ad2f6cdbfcd387c5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujodibu/jowinidafuzebufu.pdfIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_a129d2b4f856404a8265dfbd12963c6a.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_off000124e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E2 2960 bytes
SHA-256: a4eee3438a7246650f0a21218a9bc29d7bc7bf1b287bce9df301f714692068dd
font_01_sfnt_off00012f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F66 5656 bytes
SHA-256: 174cc55370548986719ddfba908457c2e262e83220cd023a0dfc77a39dc56474
font_02_sfnt_off0001429b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1429B 11216 bytes
SHA-256: 1a8226d56535a0532c24630ad95e218900398bd3c2cf2372fea2e7b2e2347733

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