Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee3ed3e4767cc9f…

MALICIOUS

PDF

108.4 KB Created: 2021-03-28 00:02:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 868324e75c947ddac8f085af0155f75b SHA-1: 576c2140863e4a1249198c1f907169662239625e SHA-256: 8ee3ed3e4767cc9f3c1c04e7672050a9a55820c546eda5823e53809db58ef858
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://xajibur.ru/wix?keyword=trucha+bug+restorer+4.3e PDF link annotation
    • https://jotukodapoze.weebly.com/uploads/1/3/4/6/134632246/573021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403819/normal_5fe8f1c2d81e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426819/normal_6017d4e4eb873.pdfIn PDF document text
    • https://cdn.sqhk.co/votezevon/mij2gdt/livestream_smart_tv_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5fd61ee70d6d0.pdfIn PDF document text
    • https://nibafowezibinax.weebly.com/uploads/1/3/4/3/134319588/dixajujosirodagus.pdfIn PDF document text
    • https://muzufuwuvul.weebly.com/uploads/1/3/2/3/132302955/kawedobomojeselugo.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/ggijfgf/artificial_intelligence_definition_computer_science.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477649/normal_5fe5ba3f07b41.pdfIn PDF document text
    • https://toroxamaje.weebly.com/uploads/1/3/4/0/134017611/7519269.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404745/normal_60080d1cdd877.pdfIn PDF document text
    • https://cdn.sqhk.co/gobefuvumi/Tjc5mV4/nuke_em_all_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/xLibqSV/20837558984.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/q9jajiv/99722658601.pdfIn PDF document text
    • https://biwawabagukolaz.weebly.com/uploads/1/3/4/7/134730268/1a7c1e1.pdfIn PDF document text
    • http://rapegutuxipik.22web.org/high_performance_cluster_computing_architectures_and_systems_volume_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/09e5dbde-dfeb-43d1-a624-271d16b9e6c3/podoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bfb3662-bcf3-4586-864a-1eb793b1ce17/why_hp_ink_so_expensive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d5f2645-a7d3-487d-9ac3-7cfc1d3b852d/dipovidobinonabipipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24397698-a9de-43a5-b857-a6efc3ee1c5f/6200322926.pdfIn PDF document text
    • http://fipiwafupogo.epizy.com/kepofosuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c4b2fc1-510c-471d-9250-4df05852678c/self_reliant_india_meaning_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b8f4cd2-9236-49b0-b650-f387d5f723a0/83430233408.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47618b61-e711-4efd-b63d-e7be105efe78/how_can_i_tell_when_my_lg_washer_was_made.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e8930c3-d3c0-4784-aefa-20c5c7f38b10/mowekuveneximubadugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20c29091-d427-44bd-a0be-35a1bb1ee03d/how_to_do_active_release_technique.pdfIn PDF document text
    • http://degedudu.rf.gd/zeluzitakifibugesokafibik.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_off000165cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165CF 5404 bytes
SHA-256: 7609e35c794abe37747fa56195f77c810659cefba3bdf10f61638d88d27ea1d4
font_01_sfnt_off00017836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17836 13312 bytes
SHA-256: 48be3adf0e797f0ff637459ccb6a022b346ad82f089814663c8bba124d76dba5