Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc2ff7425eeae84…

MALICIOUS

PDF

76.6 KB Created: 2021-04-08 01:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 054e43e4ea35acc2114abcc6242710ff SHA-1: 2d1840eb1508c1ab620ed48edcc59411ce36e0ac SHA-256: 1bc2ff7425eeae84929623f1096dc46e9e0200e4c2cae8f8b6db93526d66b526
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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-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://fokemale.ru/123?utm_term=the+biology+of+belief+audiobook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410433/normal_5fe97226304e9.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/egijbQi/dragon_craft_z_mod.pdfIn PDF document text
    • https://toxilitabosi.weebly.com/uploads/1/3/4/4/134495834/5639540.pdfIn PDF document text
    • https://cdn.sqhk.co/nawiwola/lgjifgf/zombie_smasherz_review.pdfIn PDF document text
    • https://vowimodinin.weebly.com/uploads/1/3/4/5/134599446/xeguvifiwefususaz.pdfIn PDF document text
    • https://penixosifa.weebly.com/uploads/1/3/1/4/131482878/ea6a66.pdfIn PDF document text
    • http://wosutopanoba.mygamesonline.org/aneurisma_cerebral_tratamento.pdfIn PDF document text
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/wazorexutis-rirudarokojibu-bopoweta-zimelaso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530151/normal_5ff4627f2316d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379370/normal_5fd9b2d8643e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530868/normal_6000455eb1178.pdfIn PDF document text
    • http://paxezimusosesa.scienceontheweb.net/bluedio_t-elf_mini_airpod_review.pdfIn PDF document text
    • https://mufosuxid.weebly.com/uploads/1/3/4/0/134040625/gowibusefimixefawuj.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/penyebab_atonia_uteri.pdfIn PDF document text
    • https://cdn.sqhk.co/gewewoturila/gguSjaR/universal_waite_tarot_deck_and_book_set.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/86780693246.pdfIn PDF document text
    • https://feditesar.weebly.com/uploads/1/3/1/4/131483001/pavolonatulafub_siragomodezalen_saveze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://teluroluxeterez.myartsonline.com/woragitobija.pdfIn PDF document text
    • http://kifesafijupesob.onlinewebshop.net/arbeitszeitgesetz_deutschland.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_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 5148 bytes
SHA-256: 36be157af47e02660edcf74776ab9a6f5d417e5d0a26e678ee964565b07c082f
font_01_sfnt_off0000ff72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF72 11536 bytes
SHA-256: 5edf4534270cc5c58d97e6c4fcc4e3a00059ed90d82cff3373da31f7c96be094

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