Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c502e654958fc5…

MALICIOUS

PDF

85.1 KB Created: 2021-03-04 16:22:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c1e52daa56330dfb300d97e2d3521138 SHA-1: 5b5d3d0672077138ffa59fdd1d1fa6ae8cfd3334 SHA-256: 78c502e654958fc5b97307bfa7204a2be5ff4f01399caca6abe80dd78a6e2ae4
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document that contains a mass external link farm, with many links pointing to disposable hosting. Heuristics indicate a browser extension/update installation lure, a common social-engineering tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://midufefew.ru/123?utm_term=autocad+web+app+on+chromebook PDF link annotation
    • http://esmoney.site/the_hidden_shrine_of_tamoachantpjwf.pdfIn PDF document text
    • https://dunokosira.weebly.com/uploads/1/3/5/3/135349308/3eba8856ca99918.pdfIn PDF document text
    • http://vovality.club/gagabc9xgh.pdfIn PDF document text
    • https://mofibowego.weebly.com/uploads/1/3/1/4/131406437/48d3e952ec7.pdfIn PDF document text
    • https://gununoneku.weebly.com/uploads/1/3/4/3/134309052/degabatadelosefuk.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/welizupazategizazoze.pdfIn PDF document text
    • http://stopnutristrike.ru/41660094220x1qfs.pdfIn PDF document text
    • https://xubibedizu.weebly.com/uploads/1/3/1/4/131454459/0d8b1d1c5a93.pdfIn PDF document text
    • https://mowolonob.weebly.com/uploads/1/3/4/8/134874237/0b496c3.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/gibetit.pdfIn PDF document text
    • http://wukosuwusa.iblogger.org/52694407455.pdfIn PDF document text
    • http://tihefers.online/alien_vs_predator_juego_arcade_para_androidx18s9.pdfIn PDF document text
    • http://xuvivok.22web.org/ratubatebekejopumibosigo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aefb6378-f3ca-470a-b9d2-22936542d087.filesusr.com/ugd/fe129c_c199aae05670412ea9523e1b49dd5670.pdf?index=trueIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_c1a9a47ad1514f238caa4df6a2523145.pdf?index=trueIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_e93af0d16dca47048f8f18bf44dc6386.pdf?index=trueIn PDF document text
    • http://raziwisubuza.rf.gd/gopro_hero_6_black_user_guide.pdfIn PDF document text
    • http://fudavifakafolid.rf.gd/zosibuwil.pdfIn PDF document text
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_c20cc2f2648346dca10c11407dcf76ef.pdf?index=trueIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_7947d5fdbc6046d4843910eff20d7cbd.pdf?index=trueIn PDF document text
    • http://tuguwobafadurot.rf.gd/bgee_companions_guide.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 5388 bytes
SHA-256: 597ec13e38a9d1cfe2ae566dae93f612f9e5a76a8537f0f901e3cc6ddf50dbb9
font_01_sfnt_off00012207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12207 10812 bytes
SHA-256: 125f8008bc00338097735915ae73bd112336f65345c20cbd976e1fe3df31fdf6

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