Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c174981b7fd849…

MALICIOUS

PDF

85.9 KB Created: 2021-04-03 09:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 33ab27f9508df6f9c1806c4b464c77fe SHA-1: 7577fcd803dd029df718012188b0e332534a5063 SHA-256: a2c174981b7fd84983a4073f85260e6f26ea9ee04698e1070df0d2d7d46fbc81
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classification and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains a large number of external links, many pointing to disposable hosting or potentially malicious content, characteristic of a link farm designed to distribute malware or lead users to phishing sites. The document body is heavily obfuscated and appears to contain metadata rather than user-readable content, further suggesting a malicious intent.

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://seumenha.ru/strik?utm_term=elements+of+prose+and+poetry+slideshare PDF link annotation
    • https://cdn.sqhk.co/jukelifawap/cifUjcI/72422122036.pdfIn PDF document text
    • https://cdn.sqhk.co/tezikegoj/dfigjeW/armageddon_mtg_price_masters_25.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/Kgcgifj/sago_mini_boats_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/madilaxetevo/fcJifPe/magical_forest_wallpaper_mural.pdfIn PDF document text
    • http://nitiwopororotef.mypressonline.com/bepeberivomaperazufebal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417207/normal_600a7ee97da2a.pdfIn PDF document text
    • http://nuvagefo.medianewsonline.com/ferubibul.pdfIn PDF document text
    • https://cdn.sqhk.co/dagosasojo/ihjgjjc/free_vsco_filters_for_selfies.pdfIn PDF document text
    • https://cdn.sqhk.co/titesojijuko/ithchfP/infected_cut_on_foot.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Goge6ib/lean_bulk_workout_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/ghc4Zja/pro_pinball_big_race_usa_iso.pdfIn PDF document text
    • https://cdn.sqhk.co/mumesimasozo/lpXAidO/momo_s_dressup_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481667/normal_6041c819b78b6.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jitawidavez.atwebpages.com/kejegitodajadalenefezipi.pdfIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_4c5936ba3c784effb7bc4a7d66a3ef6f.pdf?index=trueIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_5b77671cf47e45ec9fb92e2aac690c15.pdf?index=trueIn PDF document text
    • http://radopafoxewu.rf.gd/80971146887.pdfIn PDF document text
    • http://rigatage.epizy.com/bhutan_tourism_policy.pdfIn PDF document text
    • http://jigigoxeziruvi.rf.gd/system_administration_skills.pdfIn PDF document text
    • https://8e985b84-f336-4757-86d8-bf3f50c95819.filesusr.com/ugd/cac9e4_65567a4eab3645aba75346cbe241786e.pdf?index=trueIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_d4a4f131c04240c0bf3f057940f9f802.pdf?index=trueIn PDF document text
    • http://zozupajekuledus.myartsonline.com/45748552398.pdfIn PDF document text
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_c2beea79f4934d34ab6c9855a2c069fb.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_off0001059d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 1884 bytes
SHA-256: 944eb582c49ffefdefe24b87f57e27868c1023d63f5d9e48949cf7a2f7d7791a
font_01_sfnt_off00010e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E80 5340 bytes
SHA-256: 6b5a67858d93e91c23fe1eecf861e96f0d325e96f67e9362afcd8279db240529
font_02_sfnt_off00012087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12087 12004 bytes
SHA-256: c971f69dcba534bcb85461c0c7e179efd700a7c969d3a9e29eb2c84c1f6b5d3e