Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5fb7a086818103…

MALICIOUS

PDF

79.5 KB Created: 2021-02-11 09:33:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b2b31fb8a52687d17c5bce39f1e26642 SHA-1: f8e1a638eb3c6c9f1ffdd072cce7a0eea353080e SHA-256: 4e5fb7a08681810379d6a5d94020ec0a4d91732f69b2bf741d5f8621b0eaba93
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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 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/aws?utm_term=platformio+esp8266+spiffs+size PDF link annotation
    • https://cdn.sqhk.co/vevajewez/7Bhghif/stickman_destruction_4_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465390/normal_600e0bf60f6eb.pdfIn PDF document text
    • http://reduslim-shopofficial.site/car_driving_simulator_games_for_pc_downloadcp5ko.pdfIn PDF document text
    • http://help-bluebadgecenter.com/bernard_cornwell_13567y9f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366976/normal_5fe6292c0cd63.pdfIn PDF document text
    • https://cdn.sqhk.co/sifujubagis/YgjahjV/download_helix_crush_apkpure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417530/normal_5fca6ec734167.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxiwimemo/9AcWW06/find_friends_on_facebook_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/julubesaf/Pgdhbij/rezinapebusar.pdfIn PDF document text
    • http://detonic-deutschland.website/wolelebusigabizikakaromotyyp8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476593/normal_60248050f01fa.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/Viihgcj/real_cooking_games_for_adults.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lenadupubop.rf.gd/battlelands_royale_apk_mod.pdfIn PDF document text
    • http://gasunerumep.rf.gd/25246708295.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_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 5576 bytes
SHA-256: cb58b59640a2fc9733dcdaed2caca5b43a1b0d5878fdfaebc5620c382526f694
font_01_sfnt_off000107c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C1 12172 bytes
SHA-256: d6d4ec51059b50949eda0db9ff41ceea4ce4603e49614913b58993f0d80f723e

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