Malicious PDF — malware analysis report

Static analysis result for SHA-256 c883134096c794da…

MALICIOUS

PDF

82.6 KB Created: 2021-05-02 09:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f6ebee8505214f1b01543041f4757e5 SHA-1: 82ea5404fe9f2cb0220bdb17c1ac2edd7f97daf4 SHA-256: c883134096c794da18d2b1924b554824f3fce478efeebd6d4dcfcbf0b1bf4a39
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a PDF link farm, suggesting a malicious intent to redirect users. ClamAV and ML classifiers also identified this PDF as malicious, specifically a phishing trojan. While no scripts were directly extracted, the presence of numerous external URLs indicates a likely attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/strik?utm_term=who+does+eadlyn+choose+in+the+crown
    • https://cdn.sqhk.co/xurazegoba/ghqgcic/98383513412.pdf
    • https://cdn.sqhk.co/tonufipu/b0bjXge/vujezevawu.pdf
    • http://m-ryanaf.site/how_much_does_comcast_charge_for_just_internet2o5q9.pdf
    • https://cdn.sqhk.co/nadetajagupe/higcWD5/top_up_my_digicel_phone_online.pdf
    • https://cdn.sqhk.co/wojomisew/ej0hjeP/jutapufar.pdf
    • https://lefizedut.weebly.com/uploads/1/3/2/6/132681647/cb87a786a.pdf
    • http://mowogaw.mypressonline.com/limejuderitivojomet.pdf
    • https://mitivowa.weebly.com/uploads/1/3/1/6/131607237/kudizuxevafuz-zetimuvoj.pdf
    • http://hidver.com/2726802245iki3c.pdf
    • https://xubawiki.weebly.com/uploads/1/3/1/1/131163512/juposodejesodexut.pdf
    • http://aycotoro0.xyz/lesson_plan_template_secondary_schoolh8z1k.pdf
    • https://cdn.sqhk.co/penutizufib/iXW6aie/solar_system_map_printable.pdf
    • https://cdn.sqhk.co/vivepovugeli/bFiegh9/70929711481.pdf
    • https://cdn.sqhk.co/xarozowuzosa/uzH7Njh/fuludegubamiwozif.pdf
    • https://cdn.sqhk.co/jilebodetifa/wic0jik/3070115262.pdf
    • https://cdn.sqhk.co/gawagunikuw/hehizjh/perakufojuzidunagite.pdf
    • https://kebusivurokolu.weebly.com/uploads/1/3/5/3/135317059/775881.pdf
    • https://cdn.sqhk.co/nutubejagut/evhhy3T/total_war_warhammer_2_dwarves_guide.pdf
    • https://cdn.sqhk.co/gogerazina/idgiiig/lbs_to_kg_convert_formula.pdf
    • https://cdn.sqhk.co/nufopusifa/dCEjfjh/zufidojikuropafezeb.pdf
    • http://wojisub.mypressonline.com/il_cantico_delle_creature.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://sivikonalijuto.myartsonline.com/blitzkrieg_book.pdf
    • http://tokozod.myartsonline.com/detozizodejo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f882.bin
51752dbef86592ab0a986b2e6a0fa8b2f1510d6358b69f714dd2201c884c89ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 5020 bytes
font_01_sfnt_off000109a2.bin
71db58a753f4b94c524b60083d36c52ff558bd379cc7fedc185de8b2e57551ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109A2 10448 bytes
font_02_sfnt_off00012cd3.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD3 4324 bytes

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