Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa464b5319c5723…

MALICIOUS

PDF

72.9 KB Created: 2021-01-24 20:20:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c8cfe5bd2d43fba81a1c378b955b0cc9 SHA-1: e779512625d457db7e3814e423e80a169ed4162e SHA-256: 5fa464b5319c5723962bb7993941403e8d7951d746fcdbf7ca9bd766f1cb48db
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The document's content, despite being heavily obfuscated, appears to be a lure, likely to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=blank+map+of+india PDF link annotation
    • https://cdn.sqhk.co/bolukawet/gcgdgd4/starfall_reading_and_writing_journal.pdfIn PDF document text
    • https://cdn.sqhk.co/taxuvoguraji/InaidaI/guess_the_movie_malayalam_whatsapp.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiminiv/ghUyEgc/fusafizoxofut.pdfIn PDF document text
    • http://bisipatelaloguj.66ghz.com/synonyms_antonyms_homophones.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/gQmAjgu/warhammer_quest_2_the_end_times_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/Fajamym/36470690244.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/ja43Qgj/granny_square_blanket_border.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/jdibhi3/adidas_ultra_boost_19_grey.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vaxesopubowutuf.rf.gd/bedutudizilavewelafap.pdfIn PDF document text
    • http://sagalesokalu.epizy.com/jivumekakidarewul.pdfIn PDF document text
    • http://mirepili.epizy.com/new_blob_content_type.pdfIn PDF document text
    • http://xenemusexo.epizy.com/formal_email_template_business.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/bowex.pdfIn PDF document text
    • http://jidufapikefufeb.epizy.com/chambers_global_practice_guide_anti-_corruption.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 4616 bytes
SHA-256: bf19dbbefe9e7018c6b3e2b33e9a8836dd5d7d085d908dcd3a0b3c48cb80481e
font_01_sfnt_off0000e61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61E 10220 bytes
SHA-256: 0ad9e17daa41c7e1982acc3f57bfda3833a03d825d33e721bf9d53112a81e167
font_02_sfnt_off0001090c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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