Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a0c3e2c3a572732…

MALICIOUS

PDF

81.7 KB Created: 2021-02-28 18:04:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f39ab57bbefbea6add4418ad8d219af8 SHA-1: 2750243632ac05c7eb3a79ab294e451819633d4f SHA-256: 7a0c3e2c3a57273230d1fca9e36c55ead4a058f572d3430a98c931bfb1ec4563
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/strik?utm_term=jazz+toni+morrison+pdf+free'. This URL is likely used to redirect the user to a phishing page or to download a secondary payload. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL in a PDF document is a strong indicator of a phishing or malware distribution attempt.

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/strik?utm_term=jazz+toni+morrison+pdf+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4495037/normal_602472630e7f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366308/normal_601dd280939b8.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/6IigiY1/5577647455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_602d2f66ce8bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475987/normal_6008898757236.pdfIn PDF document text
    • https://cdn.sqhk.co/tudusiki/c73ibjm/ambulance_siren_sound_effect_australia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379217/normal_600fd0f4d4ebc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370267/normal_5fe2850bb8a5b.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/cEYgerD/my_talking_tom_2_apkpure.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/vukumesoj/integral_of_expxcos_x.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/94848160714.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/larevunabilixujasinedaj.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/cloudy_with_achance_of_meatballs_2_strawberry_plush.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/2551286762.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/fruity_robo_15_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/philately_quiz_2017_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/33210610221.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_off00010278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10278 5196 bytes
SHA-256: 0172bb91d93ad645dfb461b53f1cbb77e249a3199f8efeb41f68528164e196f4
font_01_sfnt_off00011416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11416 10580 bytes
SHA-256: 3693a0963bd93196f8bf885c4608a15df1f663c07d6f7ddeac41d85567b68cc9

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