Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4dc068c73883638…

MALICIOUS

PDF

492.4 KB Created: 2020-11-19 15:17:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 08f2eb94ef16895942783a980861e64a SHA-1: bf4dab868217434882eb43afa47976246832263a SHA-256: b4dc068c73883638740020f56036b2d210a1cbfbef73b40d1a48d5dd88caba8c
162 Risk Score
Tags
free-cdn-ebook-manual-lure

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://ggtraff.ru/strik?utm_term=libris+mortis+meaning'. This, combined with ML classification and ClamAV detection, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. No scripts were extracted, but the presence of embedded URLs and the redirector link indicate the likely intent is to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9179

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
  • 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.
  • 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
  • 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://ggtraff.ru/strik?utm_term=libris+mortis+meaning In PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/zejudubozoponabo.pdfIn PDF document text
    • https://busofixi.weebly.com/uploads/1/3/4/5/134576252/bamugazimedi-vexorilanagigan-vifivoj.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/ee2664.pdfIn PDF document text
    • https://guvodirafed.weebly.com/uploads/1/3/4/4/134475496/8adb28eecda.pdfIn PDF document text
    • https://diwejixa.weebly.com/uploads/1/3/4/6/134629966/5918948.pdfIn PDF document text
    • https://virukuzababije.weebly.com/uploads/1/3/4/3/134350100/fomepefepevopada.pdfIn PDF document text
    • https://gonerogad.weebly.com/uploads/1/3/1/4/131438616/b9247dde35.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/jazikipipu_pudaxujopor_jodexetiwetap_ninegirel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_5f9876cee40f3.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/72f5aec7-e01a-473b-8fa3-521db48613e4/dynamical_systems_theory_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8f071ec-596a-4e23-a90c-70c4522bf4a1/tunozabupipez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02f1d9ad-1032-4a22-88ae-62ba06b6b270/paropipabolimazek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8174b7a5-2c85-42b0-954c-2a4deb2550c3/parts_for_bostitch_nail_gun_sb-1850bn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e6e77f0-42be-4737-ba3d-8485c645b701/34060701990.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_off000766b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x766B3 5056 bytes
SHA-256: 655bbc1677eb26dfb48b8050ac09866cf1114f7e0264b64d4af0daa3d476dcb5
font_01_sfnt_off000777c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x777C9 12932 bytes
SHA-256: 0fa9dc69cce32f20a2c0b71c2549676b1194c039556f4c5384ea75f3994971b5

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