Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a425b31feea5124…

MALICIOUS

PDF

65.6 KB Created: 2021-01-11 18:12:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f939d4729bcf4dc137a8f78b815e9202 SHA-1: 11ec0cecbe37334320b800b3036de7fb9f7173dc SHA-256: 2a425b31feea5124ec0ddaa8d6de6d4d33fcae181bbf8daa988a103bc9029b5a
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 attempt. The embedded URL is designed to trick the user into clicking it, likely leading to a further malicious download or exploit. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/123?utm_term=norwalk+public+schools+teacher+salary In PDF document text
    • https://cdn-cms.f-static.net/uploads/4402936/normal_5f943ee8d1580.pdfIn PDF document text
    • https://cdn.sqhk.co/xekiparot/Y7ihhdG/word_farm_crossword_cevaplar_135.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415309/normal_5f9b122e320a8.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/Tjg8Y6I/sejodixowesezo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404113/normal_5ff7b4b025cf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368950/normal_5f9cbaaa86aff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450240/normal_5fb6057b0d851.pdfIn PDF document text
    • https://poxobavu.weebly.com/uploads/1/3/1/4/131453713/gazavozatadarope.pdfIn PDF document text
    • https://cdn.sqhk.co/vosiwuli/fihMjdI/duddu_my_virtual_pet_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/hiqvDih/bot_designer_for_discord_apk.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/tokit/paperbacks_from_hell.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_off0000c422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC422 5388 bytes
SHA-256: e1dfc54606edbdec4a5107f64e125267256b37b2713409b3b96df05606e1fcc0
font_01_sfnt_off0000d684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD684 10396 bytes
SHA-256: 4d51efb42230056e9cee4c19d09948ea6f57cab1cae17d62740cf4459cf87921