Malicious PDF — malware analysis report

Static analysis result for SHA-256 409085bf271fa906…

MALICIOUS

PDF

68.5 KB Created: 2021-04-08 08:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dce0c8b49a46e51118ceb875193e98a8 SHA-1: e9f4194f0cb1ac34b4a4b6f324f750fc20cde171 SHA-256: 409085bf271fa906383f31c0f495f0552258c270a5cfc3d0570eaa2a98aed89c
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/wix?keyword=pearson+interactive+science+grade+6+pdf+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383147/normal_5fe2c3f50f829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450043/normal_5fdb6d8d0a0c3.pdfIn PDF document text
    • http://debopuforu.22web.org/cushman_wakefield_vietnam_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413226/normal_6015aebb99a95.pdfIn PDF document text
    • https://zotadapavera.weebly.com/uploads/1/3/4/4/134483721/sixexedo-tegumige-foxizip.pdfIn PDF document text
    • https://wufovepujiz.weebly.com/uploads/1/3/0/7/130775368/ranitiguda-vutut.pdfIn PDF document text
    • https://morisoxurekes.weebly.com/uploads/1/3/4/4/134464458/95a0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_60209df7cbc50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412413/normal_602528e50c798.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426955/normal_6016d519e44d4.pdfIn PDF document text
    • http://naderuromopuru.22web.org/tropico_4_trainer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479235/normal_5fdcb87922963.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/741c219c-9f7f-4edf-be99-a757a2de7a9f/what_is_the_theme_of_metamorphoses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e21b1ba-d7c9-48c6-9d1a-25b3a8c5bece/bufabujeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5a7d185-ab52-4227-8003-32649daf8fd0/sandisk_sansa_fuze_mp3_player.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0b0ab43-a05e-4c2b-af98-c89430ef588c/vurosevinunazepaliv.pdfIn PDF document text
    • http://nekanonesogur.rf.gd/likorodepilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/572583e2-61be-428d-80a3-57808bcc4581/51327695472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/131f3b3e-50ba-4caa-bf73-5e546b359753/dns-323_manual_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7331d826-5e96-4bc6-a994-d89ee596dca4/xapudimixarifizeli.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_off0000cd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0D 5764 bytes
SHA-256: 6c916ba98925d1cd7743bc0595da552035968d356869a5398d4a459e21784b4c
font_01_sfnt_off0000e0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 10620 bytes
SHA-256: 15ed1d4805035fb23daf49a44122f167f76a477e09147d8ead686e3045af5c77

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