Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e466314bbbd148b…

MALICIOUS

PDF

72.9 KB Created: 2021-04-22 23:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b4cb9be94ec8e1db1e8590ed469ed840 SHA-1: 5946a79c0f379d1231c36eb6fdb5397c611e789d SHA-256: 8e466314bbbd148bed3987519b846a3de04a2fae9952ffa4a737f81192834a03
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://resalured.ru/strik?utm_term=can+you+have+gyro+meat+on+keto PDF link annotation
    • http://vittorguxx.site/25810494116654mu.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/gfic8xc/my_tasks_planner._to-_do_list._organizer.pdfIn PDF document text
    • http://buybritishcat.com/24833439224yhwhn.pdfIn PDF document text
    • http://yozi.store/74834579638lyaoh.pdfIn PDF document text
    • https://cdn.sqhk.co/jonuwezipagi/bifjivZ/46929784481.pdfIn PDF document text
    • https://gelowoxolup.weebly.com/uploads/1/3/4/7/134703814/vukawutima_gijikexuzip_simiba.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/gjjepih/2408189882.pdfIn PDF document text
    • https://motoburibekisi.weebly.com/uploads/1/3/4/6/134623685/6208379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481667/normal_5fd27b8b95d82.pdfIn PDF document text
    • https://runidodejifam.weebly.com/uploads/1/3/4/0/134040950/xodir_revajezum_totexutag.pdfIn PDF document text
    • https://cdn.sqhk.co/xafumeko/ghghhde/bhopal_shatabdi_12002_platform_number.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/15912199021medyk.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/eAihFjc/nexatusadezopo.pdfIn PDF document text
    • https://cdn.sqhk.co/fedugaxoloz/h0k6DqJ/10473211443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483836/normal_6014e4e4ec262.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/jywEibY/22796760055.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/vsiijgp/68333775172.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/VJXuAhf/6679438260.pdfIn PDF document text
    • https://cdn.sqhk.co/tovitaxani/x3hbje0/kegefenopivetuzo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419451/normal_5fe043ff23c98.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE147 5020 bytes
SHA-256: e41994f0b75d9c705ad71d37d9615f2b97b78f5287436d626b610254311baa4c
font_01_sfnt_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 10600 bytes
SHA-256: 25395b791e1a028a10fa3ff593ee06b2adca57ceedd7c0088450dfbbc609de26

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