Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc9447dafba62c3…

MALICIOUS

PDF

96.3 KB Created: 2021-04-03 15:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 08687b4978e95169698fcc9718ba6f2f SHA-1: 1871cee19724c02e8d4b4a0b59c9a9372cffb619 SHA-256: 9fc9447dafba62c367cf25b4a41dc27aa8414dd922b1c35de9a62d30c5d98fa9
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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=hearts+of+iron+3+usa+guide PDF link annotation
    • https://popibixa.weebly.com/uploads/1/3/4/7/134745137/nivixef-vasudupewufefi.pdfIn PDF document text
    • http://reduslim-italia.website/game_launcher_applef2iw3.pdfIn PDF document text
    • https://cdn.sqhk.co/geruxibab/JlhjjXs/vebotokipifiwuburu.pdfIn PDF document text
    • http://reabook.online/5426186319p3cb2.pdfIn PDF document text
    • https://cdn.sqhk.co/rubalibuzodi/yVnUhgh/vedesukivagifek.pdfIn PDF document text
    • http://moneyindia.site/natapagagozutufilumo7uvlf.pdfIn PDF document text
    • http://labincom-med.ru/kadhal_kavithai_movie_songstuqme.pdfIn PDF document text
    • http://vadosixajobirug.mygamesonline.org/toyota_camry_2020_price_in_canada.pdfIn PDF document text
    • https://nivavige.weebly.com/uploads/1/3/0/7/130739715/6154931.pdfIn PDF document text
    • http://foramodosug.mygamesonline.org/71406897471.pdfIn PDF document text
    • https://cdn.sqhk.co/vakujediraw/fwRjeDz/votiripavaxow.pdfIn PDF document text
    • http://tofoxewesaxizuz.mywebcommunity.org/xurutuniwuwawaboli.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/NgijaOT/21276608319.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvaratuji/jhjarge/nupobosopatul.pdfIn PDF document text
    • https://pejupatuwotim.weebly.com/uploads/1/3/2/8/132814375/mijiw-tokuwetebopu.pdfIn PDF document text
    • https://cdn.sqhk.co/zesokepewami/f4jhwbr/penguin_readers_level_6_vk.pdfIn PDF document text
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/5991097.pdfIn PDF document text
    • http://lipazegeboludep.sportsontheweb.net/how_much_money_does_a_network_security_engineer_make_a_year.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://beliraguw.onlinewebshop.net/51121687329.pdfIn PDF document text
    • http://faxevimisosideg.myartsonline.com/nefemewirelobe.pdfIn PDF document text
    • http://jikelaxapexa.onlinewebshop.net/jurnal_anemia_megaloblastik.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_off00013a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7B 5168 bytes
SHA-256: b425ed2199ea7d96a5b6339b02130a170a3c114fac94328ebd5824235ab0581c
font_01_sfnt_off00014c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1A 12000 bytes
SHA-256: 0764974b2247f4e85967853867e951105fe095f740a5a62590a026da09c52152

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