Malicious PDF — malware analysis report

Static analysis result for SHA-256 308d6f077d97d709…

MALICIOUS

PDF

68.0 KB Created: 2021-02-26 17:44:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e04f6fa2c7a8124936d95506a38e8ba9 SHA-1: 6bc4be9324e3e4856eb123de92acee9b82ec5ab1 SHA-256: 308d6f077d97d70992d823e87dd2f229af583e30b0104fc2fd922f3bd9464597
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, and contains a large number of external links, many pointing to disposable hosting. This indicates a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=warrior+goddess+training+audiobook PDF link annotation
    • https://guparamoribum.weebly.com/uploads/1/3/2/7/132711937/8129166.pdfIn PDF document text
    • http://tuimag.ru/47926123509g0d26.pdfIn PDF document text
    • http://top-salez.site/red_balloon_song_homebhmmb.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/kCBgi63/billboard_hoarding_photo_frames.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/cgdxkYP/wifi_drivers_for_windows_8._1_32_bit.pdfIn PDF document text
    • https://roxupabepali.weebly.com/uploads/1/3/4/6/134611875/432e89894.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/79741921118.pdfIn PDF document text
    • https://rapexukiwivusa.weebly.com/uploads/1/3/4/8/134856806/3132035.pdfIn PDF document text
    • https://cdn.sqhk.co/felodunom/hejdTz7/letterboxd_app_for_music.pdfIn PDF document text
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/bb6401b37d.pdfIn PDF document text
    • http://raisinshub.club/kamosuduwekifs8zh.pdfIn PDF document text
    • https://cdn.sqhk.co/fapiwejagiz/ahIny7Q/datizomixewalanagiluzal.pdfIn PDF document text
    • https://biwewonopegad.weebly.com/uploads/1/3/1/3/131380063/zakajexomewuvom.pdfIn PDF document text
    • http://top-shop-store.website/pepobalwjxss.pdfIn PDF document text
    • https://fadasizoguwo.weebly.com/uploads/1/3/6/0/136050507/xukafosapiwo.pdfIn PDF document text
    • https://kewakovek.weebly.com/uploads/1/3/4/4/134467638/fawilutemu.pdfIn PDF document text
    • http://rowexusaje.mypressonline.com/dirt_devil_power_stick_filter_f2.pdfIn PDF document text
    • https://kudaxemukuwofi.weebly.com/uploads/1/3/4/6/134691428/rizojo_kepoti_nirekoxi_mobaxivuvo.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_off0000d109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD109 5176 bytes
SHA-256: 81a464c10fb038b37ec68fd4ccb37926376edcde3b975accf07f7b28adf516c9
font_01_sfnt_off0000e2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C1 9456 bytes
SHA-256: 9adb358e384d4cfa9992de26918bdd7dfcf7574ebbf622d4f9a8f5aceaf6fb84

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