Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d6c7103c60d0a3…

MALICIOUS

PDF

74.9 KB Created: 2021-03-11 10:18:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 16638d9b45e2ed52c363a2db0012ea14 SHA-1: 48e4e1b6f57d4142331dea84f59edd07c666cd9b SHA-256: 34d6c7103c60d0a3ff862ad2d1d0a56eda6da94e79096ec3252b203648c6468e
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure, directing users to external sites for further compromise.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=declining+labor+and+capital+shares In PDF document text
    • https://dozadekexojigig.weebly.com/uploads/1/3/4/0/134096874/kiboduwata.pdfIn PDF document text
    • http://reawont.online/17551044750kzg0.pdfIn PDF document text
    • https://cdn.sqhk.co/rokajoten/eigEid4/murujuxe.pdfIn PDF document text
    • https://tekoriforeta.weebly.com/uploads/1/3/4/6/134639422/6015924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463298/normal_6016c14cbb3bd.pdfIn PDF document text
    • http://my-favshopg.online/adventures_of_tom_sawyer_and_huckleberry_finn_moviewim82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404122/normal_5ffcac124c2af.pdfIn PDF document text
    • https://cdn.sqhk.co/jasamomedam/EicWdgc/five_nights_at_freddy_s_game_2_demo.pdfIn PDF document text
    • http://madawuboso.sportsontheweb.net/milisazuv.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/what_constitutes_a_breach_of_trust_and_confidence.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/ageAXjb/game_creator_unity_asset_store.pdfIn PDF document text
    • http://fherixq.com/the_last_sherlock_holmes_story_read_online0c4g4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377935/normal_6041e327bdde7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470027/normal_5fd671fb9b7fe.pdfIn PDF document text
    • http://tejidirexe.mywebcommunity.org/30376964287.pdfIn PDF document text
    • https://cdn.sqhk.co/derepinejabi/6IGmKgh/balenciaga_sale_triple_s.pdfIn PDF document text
    • http://wojisub.mypressonline.com/95896710004.pdfIn PDF document text
    • https://jovigazever.weebly.com/uploads/1/3/1/6/131637362/lakenasedupip_ruwajo_nabodow.pdfIn PDF document text
    • http://jobware.pro/curso_aprendizajes_clave_historia_secundariaka83f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/daxozeselazuzokabiv.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_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 5476 bytes
SHA-256: fa9ca833a0194adec377e96973ffa3ad5af95ac748377ff62e1b4eb1ef723ee3
font_01_sfnt_off0000fb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB29 10196 bytes
SHA-256: 1f4a615f3ef2c9388461fa78823a8d7b8e3103305cfb31363f3702f88e920445

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