Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a27f36688ae6ca5…

MALICIOUS

PDF

82.4 KB Created: 2021-02-28 00:42:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 617c7e531e380903bcab181f716c281d SHA-1: 5380375ee7ca9b63f2fd0839e312f026b240cbf8 SHA-256: 3a27f36688ae6ca525a066b0aaf749762fdab7fa47303392dc5c089093da8707
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to 'Stihl lawn mower', likely a lure to attract clicks on the embedded links.

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://midufefew.ru/wb?keyword=stihl%20lawn%20mower%20any%20good PDF link annotation
    • http://pofaduxiruk.getenjoyment.net/husqvarna_440_factory_carb_settings.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/lemunoroxowini.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489615/normal_5ff7ab34cc962.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443578/normal_5fd06150798da.pdfIn PDF document text
    • https://cdn.sqhk.co/dowotovewi/cFhb5if/gofovomududafenuvameju.pdfIn PDF document text
    • http://xenalebosob.scienceontheweb.net/how_to_check_tecumseh_ignition_coil.pdfIn PDF document text
    • https://jeduwisuduxib.weebly.com/uploads/1/3/1/4/131483356/8817770.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/holy_quran_application.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416930/normal_5ffe0b21b3c08.pdfIn PDF document text
    • https://xuwogufovesuvem.weebly.com/uploads/1/3/1/4/131406895/savoj-lulevabaso.pdfIn PDF document text
    • https://janusizexagelu.weebly.com/uploads/1/3/5/3/135337128/fabifom-jolozuxan-xowug.pdfIn PDF document text
    • http://nipizakevenuvis.scienceontheweb.net/rancilio_silvia_upgrade_kit.pdfIn PDF document text
    • http://ladekepevij.mygamesonline.org/why_is_my_frigidaire_fridge_not_cooling.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roveramo.atwebpages.com/color_atlas_and_textbook_of_diagnostic_microbiology_free_download.pdfIn PDF document text
    • http://tozibuxadotoba.epizy.com/awards_for_all_england_guidelines.pdfIn PDF document text
    • http://revudipepofaten.myartsonline.com/price_action_scalper_ea_review.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_off00010522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10522 5356 bytes
SHA-256: 44e38329305751ed406d221c40c03d76c05ab667dc5a6a611ea8a90c0fdf9deb
font_01_sfnt_off00011748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11748 10916 bytes
SHA-256: 571a52b2e423057fb28085567547dd880f47d240610e644ebcc09430b6b4e5a8

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