Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ac9dd9b86f7fbc…

MALICIOUS

PDF

76.3 KB Created: 2021-02-14 00:12:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9ec8d9b4abb7948b4c9a0defc1f1e656 SHA-1: 48a2618286a5451cefd3110a7e45a6c9e88a1099 SHA-256: a2ac9dd9b86f7fbc38301998c74d7a9416cf1b9c72c38f05ab582719373c289a
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://crophysi.ru/wb?keyword=cimetidina%20mecanismo%20de%20accion%20pdf In PDF document text
    • https://cdn.sqhk.co/rabuvimi/aibgeij/72298823755.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486565/normal_5fc7fb810b9bd.pdfIn PDF document text
    • https://cdn.sqhk.co/femelofep/MJa8Cha/visual_studio_code_login_github.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428061/normal_600b6a9c3fdd0.pdfIn PDF document text
    • https://cdn.sqhk.co/dexediwiboze/hhhgchf/sojawoz.pdfIn PDF document text
    • https://cdn.sqhk.co/mimofeto/MHjhVhh/frog_ninja_hero_gangster_vegas_superhero_game.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/whbidgf/senya_and_oscar_the_fearless_adventure.pdfIn PDF document text
    • https://cdn.sqhk.co/wawabosamugo/YRxjjFw/phage_symbiote_venom_movie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaxowudupa.rf.gd/74569796883.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/gangster_squad_game.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/xufadalezikezuwubopo.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/solving_systems_of_inequalities_word_problems_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/82036273702.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/69510199593.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_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 5080 bytes
SHA-256: 4c79461b7060aed034fe6a3a6982f5e6c2cc1512c78acf27720587623e5b9a92
font_01_sfnt_off0000fd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 11296 bytes
SHA-256: a3489adf84993d4d5ab2e70108a7dac651e5dd13138ec3c2faedea10f38bfd53

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