Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0665926c8571bb…

MALICIOUS

PDF

76.9 KB Created: 2021-03-09 09:33:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4383902eb6f7e5ae0363adaa880b314f SHA-1: 15764f536e6b10ecf91cb5ef5249bf5fe82ece83 SHA-256: aa0665926c8571bb13ba69a311de9fc04ba49f16de1ea4f280121b5479e8c9da
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://baarspo.ru/award?keyword=brochure+design+templates+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480758/normal_60146065c936a.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/kindle_model_d00901_will_not_charge.pdfIn PDF document text
    • http://soferijivav.getenjoyment.net/how_to_control_volume_on_xfinity_remote_app.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/irnthaI/pajapebusiloxa.pdfIn PDF document text
    • http://ziximotizaned.medianewsonline.com/72912166226.pdfIn PDF document text
    • https://cdn.sqhk.co/xapawavuma/hcgwifj/38652296043.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481275/normal_5fcae67995b86.pdfIn PDF document text
    • https://cdn.sqhk.co/kapapomabu/bB5hiyP/spiral_fracture_humerus_treatment.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/ezia6jj/pacific_time_to_central_time_to_eastern_time.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://povodakav.myartsonline.com/kejugesorimo.pdfIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_a43adbf4333b4378b267a176e9896dec.pdf?index=trueIn PDF document text
    • http://bagozorox.rf.gd/avensis_verso_repair_manual.pdfIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_880d0c75b438465db4d1a34bbb950b86.pdf?index=trueIn PDF document text
    • http://maderenefozido.rf.gd/how_to_program_ge_universal_remote_to_dvd_player.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_fefa9558959b410194d4584f40563d4e.pdf?index=trueIn 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_off0000ef6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6A 5712 bytes
SHA-256: 0ad6c73a67a2907a17254d672cf7a793f77f10d6b33e826b24f1b1a6a642905a
font_01_sfnt_off000102c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 10556 bytes
SHA-256: 79fe5c612fba1f4946f88c336394bf909c4e9ee50c0a2ec56c42b70482aa07ec

Open this report in the interactive analyzer, or submit your own file for analysis.