Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f35d59287f53b1…

MALICIOUS

PDF

80.6 KB Created: 2021-04-15 04:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d05fba1adc7fee9b60405548515f0aef SHA-1: 54f401ce1f1d8795108f7fd1666d1bfe7094c05b SHA-256: a4f35d59287f53b187cf2e0c2edc0aeacb90a86e4ece250cd127c347b2277899
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains associated with link farms and potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a scam. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=what+size+tires+are+on+a+2012+ford+focus+se
    • https://zewalomoweso.weebly.com/uploads/1/3/4/5/134588134/6439563.pdf
    • https://cdn-cms.f-static.net/uploads/4381997/normal_603bb5b4b06f3.pdf
    • https://cdn.sqhk.co/tefazaturar/pfljjjf/basub.pdf
    • https://static.s123-cdn-static.com/uploads/4460057/normal_5fcbda442ec2a.pdf
    • http://uscarins.info/the_cat_in_the_hat_knows_a_lot_about_christmas_traileri7dzz.pdf
    • http://italia-doc.fun/90308307344isjs8.pdf
    • http://antonioit.space/mcgraw_hill_connect_biology_answers_chapter_4i89st.pdf
    • http://laitlabs.pro/what_is_the_best_gym_equipment_for_home_to_lose_weightj1jz5.pdf
    • https://lewuseloti.weebly.com/uploads/1/3/1/4/131437615/15ed25c9e622.pdf
    • https://cdn.sqhk.co/businaxidare/hfpNgdi/uncharted_4_prison_escape_game_download_pc.pdf
    • https://womagojewe.weebly.com/uploads/1/3/5/9/135961056/nuxolererim.pdf
    • https://cdn-cms.f-static.net/uploads/4383687/normal_603bf67564c1a.pdf
    • https://cdn.sqhk.co/gokarunedod/jiRgcHX/poxutoxizibif.pdf
    • https://denutuzuno.weebly.com/uploads/1/3/4/7/134706868/wibojatav_xalikupudajenaj.pdf
    • https://gegovowazuravas.weebly.com/uploads/1/3/1/3/131398401/duwitud.pdf
    • https://fekubikutoji.weebly.com/uploads/1/3/4/1/134108901/936c6b.pdf
    • https://cdn-cms.f-static.net/uploads/4501361/normal_5fd76e0d26500.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_623042251ae14ed78827eab555e7d9ea.pdf?index=true
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_ec0e29c5c5624b6aaa8017c5bdb80f0a.pdf?index=true
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_c272ade019074b00b6bb12ec4e697ce4.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee40.bin
61e95f3d216ed013636ed972cf6fb4f881bc8394960d0f01bbfe497a4b50100e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 5348 bytes
font_01_sfnt_off00010081.bin
ca8a8664e92ad2d4ff002f377afe6346bb88df802b6fcd6cf7d90167f98058f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10081 11072 bytes
font_02_sfnt_off0001267e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1267E 4324 bytes