Malicious PDF — malware analysis report

Static analysis result for SHA-256 7687e8c232fa8492…

MALICIOUS

PDF

103.2 KB Created: 2021-02-24 20:36:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 97cdce9306a57b47ad0b8e4dc814bc93 SHA-1: 21ea99cc04e2e30f87f4408f76b541ea6fde8307 SHA-256: 7687e8c232fa8492f974000d275ccd42ff1706680acb7e6f0e3364ebef4cb47b
184 Risk Score

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 and routes users through malicious redirector infrastructure. 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=cuadernillo+de+ingl%25C3%25A9s+basico+para+adultos+pdf In PDF document text
    • http://astropsychology.site/suwajiwub1it79.pdfIn PDF document text
    • http://ndfnasg.xyz/jamajukrmsuq.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/pdeKBgj/traffic_rider_all_bikes_unlocked_download.pdfIn PDF document text
    • https://kagiwegelugamed.weebly.com/uploads/1/3/1/4/131453087/kawewoki-jewanav-neterowax-wedewulureji.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/DuThcgc/dewozuf.pdfIn PDF document text
    • http://badge-verification-center.com/bompani_cooking_range_user_manualqxeyn.pdfIn PDF document text
    • http://dragonflysagewellness.com/lpg_co2_system_data_sheetsfckel.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/hcgc5jj/94997501336.pdfIn PDF document text
    • http://0fruit.space/playboy_price_guide4v7as.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/baby_goats_bouncing_on_trampoline.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zevusup.atwebpages.com/how_hard_is_gre_quantitative_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/mozilla_firefox_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/sotujoxuwakikalifevoke.pdfIn PDF document text
    • http://widifusi.myartsonline.com/14146343390.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/61507938108.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F41 5512 bytes
SHA-256: 53dda70e23663a625e6c5f633b05ab38cb80773b05fab79fe9a516e7a75d00af
font_01_sfnt_off000161be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161BE 13500 bytes
SHA-256: 59849b5b55f4c00fb66c534450b87b32836c1df4b52fcd675f80dc22fe4fed5b

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