Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9b412625746e20…

MALICIOUS

PDF

88.0 KB Created: 2021-03-30 14:39:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a6a53087845f5961a9bb8a5503f2fdcf SHA-1: aa94f9358769fffda49a4a428ff5c76d6bbb4770 SHA-256: 3c9b412625746e204798f48d52070fbf2c2ad5992930af8a85fe771a5193caba
186 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, including one pointing to 'jumiwimov.ru', suggesting it's used for phishing or distributing further malware. The document's content, though heavily obfuscated, appears to be a lure related to 'horror thunder sound effect free'. No scripts were extracted, but the presence of multiple external links and the detection results strongly suggest a malicious purpose.

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://jumiwimov.ru/123?utm_term=horror+thunder+sound+effect+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412780/normal_5ff6b0b52035a.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/facts_about_earth.pdfIn PDF document text
    • https://boxemafal.weebly.com/uploads/1/3/3/9/133997404/75f5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374536/normal_5ffba40927601.pdfIn PDF document text
    • https://fubuvomaxafufil.weebly.com/uploads/1/3/1/6/131637814/8348468.pdfIn PDF document text
    • http://dazavaluk.mygamesonline.org/75843359309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489414/normal_5fd7855f6a41d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393359/normal_6014e4104ff04.pdfIn PDF document text
    • https://nogulakotu.weebly.com/uploads/1/3/0/9/130969216/vegepidunemawifiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457861/normal_604d007e6ecfc.pdfIn PDF document text
    • https://bitugibetofovo.weebly.com/uploads/1/3/0/9/130969362/396950256af448.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_45391cef728b49f7a625e2e7a9b6a2b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d84715ed-0d2e-4c4b-a248-7ab4e22b2604/harley_davidson_owners_manual.pdfIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_338e7eb3dd90427aae1afe36d5a4a900.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9267a27d-9379-4bdb-95af-30f4a71311c4/33751375226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ede7a0c-6610-4afd-8d94-65611bb073b7/how_to_service_a_gas_heater.pdfIn PDF document text
    • http://sulorowanutabu.atwebpages.com/agenda_escolar_2020_19_para_imprimir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f83c8bd8-0eab-495d-8b91-12ce15c2e6df/what_is_the_best_jiu_jitsu_gi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c88870bf-c1da-4c9e-b52b-965399ca75d0/reset_toner_brother_mfc-l2700dw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be51e8db-e542-44ef-b859-0c27e99e0c38/kezia_noble_free.pdfIn PDF document text
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_2693c93ef9264fa384ef18a165f59a61.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b528dbc-1995-42cf-a5a8-5bb34fc22f75/wezatixosunuwo.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_off00011f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F57 4828 bytes
SHA-256: 7a4bb5221031d12139e94d888e553a3c72b4e1d143b1e7faa8147018cb6626cb
font_01_sfnt_off00012fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC0 10288 bytes
SHA-256: ed004ef194eaa9c5b7b2f73f39ae7a1a0e02a920cdef538de54fb831fdfe50a1