Malicious PDF — malware analysis report

Static analysis result for SHA-256 28341073c3945162…

MALICIOUS

PDF

63.7 KB Created: 2021-01-24 15:57:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bd025466abaa1e0c1ee73311ad875a7f SHA-1: 516458fabbf6bdf6883419f88693c48f536686d8 SHA-256: 28341073c3945162af5284f4d441bad123504603238d07b4a6ebb52129b6c929
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, strongly suggesting a phishing or malicious redirection attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support this assessment. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafffi.ru/123?utm_term=cody+regional+health+jobs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420597/normal_5fcaad56d3d92.pdfIn PDF document text
    • http://fitness-ital.fun/globe_at_home_app_dashboard4cuv7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382781/normal_5fd7d67f2a19b.pdfIn PDF document text
    • https://cdn.sqhk.co/befulirawid/Xu3iehc/jinafuxupilolivokix.pdfIn PDF document text
    • https://cdn.sqhk.co/kurapobal/tijfkij/sniper_strike_shoot_killer_unlimited_money.pdfIn PDF document text
    • http://nubolutlion.xyz/ikea_kitchen_cabinets_sale_2020akhds.pdfIn PDF document text
    • http://swiss-gear.shop/lolesikewijegujipinulewi50sn5.pdfIn PDF document text
    • https://wugexufaferefe.weebly.com/uploads/1/3/0/7/130776446/newumid-gelixopeju-titekogikima.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446914/normal_5fd9bab135e75.pdfIn PDF document text
    • https://cdn.sqhk.co/zifixanuk/epmihYD/big_blue_marble_academy_villa_rica.pdfIn PDF document text
    • https://lelobetiladafan.weebly.com/uploads/1/3/4/4/134497055/6157864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452398/normal_5fda7364cb4d7.pdfIn PDF document text
    • https://nubipudovolena.weebly.com/uploads/1/3/4/0/134012318/milatetuxas.pdfIn PDF document text
    • http://optarfes.com/20020853914ezaae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/liluvad/architectural_technician_cv_template.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_off0000bf40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF40 5308 bytes
SHA-256: 4e4cd0c65621a416e4d95c9633d65c0a8821936dcff1ec3cbff156664b170117
font_01_sfnt_off0000d146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD146 9544 bytes
SHA-256: e51510404225b8edfc48c352b61bd6693cc75901a10b3b9cd5fcc155f9317630

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