Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b407d9e65f4d459…

MALICIOUS

PDF

84.3 KB Created: 2021-02-14 03:51:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5f9511595f9da236e58d67be5251c437 SHA-1: b3c39a570c397b6ed6dce85a35f59a88dfaa58f3 SHA-256: 9b407d9e65f4d459af52a0cadcc2d311eaeb7c901f92a41fdef5b8e6d7ddcc7e
126 Risk Score

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 0.9998

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://leonvi.ru/123?utm_term=trader+vic%2527s+bartender%2527s+guide+1947 PDF link annotation
    • http://moreprodukti.com/suvijol1alo.pdfIn PDF document text
    • http://best-store.club/winner_soccer_evolution_hack_mod_apkeledh.pdfIn PDF document text
    • http://manybigs.space/carnatic_music_free_download_mp3_instrumental8dl6o.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/996172486338y8f6.pdfIn PDF document text
    • http://milesnires.xyz/the_intelligent_investor_freev1v63.pdfIn PDF document text
    • https://cdn.sqhk.co/patemugimej/f1haSgh/gezonujes.pdfIn PDF document text
    • http://kuzunutonaw.22web.org/nombor_dalam_bahasa_arab.pdfIn PDF document text
    • https://cdn.sqhk.co/vebiziwob/5Kpjgiz/athletic_apparel_brands_logos.pdfIn PDF document text
    • http://sakajutapud.22web.org/tv_channels_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/somisafeg/jgphcja/art_of_war_book_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/kitatoze/ghXU9ZW/gufegibuzemegesod.pdfIn PDF document text
    • http://kilidivofafo.iblogger.org/academic_research_report_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mutifitiwexo.epizy.com/jinofonefagarenumubeb.pdfIn PDF document text
    • http://zefuxaninegug.epizy.com/edhesive_assignment_2_room_area_answers.pdfIn PDF document text
    • http://roparewuna.rf.gd/earthing_pit_test_report_format.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/tibemoxodunufadasebukufem.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_off00010939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10939 5632 bytes
SHA-256: edcbb91736152105d9668b7f2828bb1b394ea8562046b4410edf0c50e392504e
font_01_sfnt_off00011c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C88 11920 bytes
SHA-256: ad6fa908b2390e4fe1bed4689b7ca72e4e9285340027c3c63f97d0784d0c8829