Malicious PDF — malware analysis report

Static analysis result for SHA-256 33364efee223bf15…

MALICIOUS

PDF

291.1 KB Created: 2021-03-15 02:01:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5bf96edddd7f4813e5fcfc794327caab SHA-1: bb25543b938b593f66890e2065bce161c7ac2d34 SHA-256: 33364efee223bf15facd6cda34843e280b19254014f68bef639b2d770ee6a58c
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with high-confidence heuristics indicating it's a phishing lure using an SEO redirector. The document body, though truncated and obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of multiple unknown URLs, including one with UTM parameters, strongly suggests a phishing campaign aimed at redirecting users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://fokemale.ru/strik?utm_term=montana+1948+pdf+free PDF link annotation
    • http://usacreditcheck.info/fadumovilixedatc.pdfIn PDF document text
    • http://ruwemipuwev.mypressonline.com/4976446771.pdfIn PDF document text
    • http://fartook.online/letunaxirakok9ohrh.pdfIn PDF document text
    • http://wapadax.scienceontheweb.net/anthropology_syllabus_for_upsc_download.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/the_fallen_leaf_thai_drama_ep_4_eng_submyu8o.pdfIn PDF document text
    • http://servisvds.ru/the_heart_of_darkness_by_joseph_conradhz8tc.pdfIn PDF document text
    • http://bupro.asia/digexubakolepegozavdy3ot.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/tolemasudufubazune200ys.pdfIn PDF document text
    • http://frukt.fun/nimazekuwunuberune2t6sz.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/94815111610.pdfIn PDF document text
    • http://triple-doska5.club/jolaswpdnx.pdfIn PDF document text
    • http://goligofalu.medianewsonline.com/food_allergy_training.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3156a51a-7629-446e-a928-2fa2f8bcd325/jobedumofoboxupumin.pdfIn PDF document text
    • http://dusujelad.rf.gd/jobs_after_mba_in_supply_chain_management.pdfIn PDF document text
    • http://fawogalupa.epizy.com/automated_testing_interview_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c8b6454-5a99-42b7-8992-19de943c06ff/21224434395.pdfIn PDF document text
    • http://xafinoligu.epizy.com/gifepotosexi.pdfIn PDF document text
    • http://doriponesarom.myartsonline.com/patixo.pdfIn PDF document text
    • http://jozobudesurarab.onlinewebshop.net/assignment_first_page_format.pdfIn PDF document text
    • http://pujixedigegogup.epizy.com/android_phone_cases_reviews.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_off000443da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x443DA 5320 bytes
SHA-256: 6cf03597b0358571bacddee5797b6aa9539be1f67becceab9ff9c4e304bd1d8a
font_01_sfnt_off00045615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45615 11908 bytes
SHA-256: 5c7d4e50e890ad0b55deee0bc4eb928e20dfddd0c1e9c3297397c24d55228908

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