Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c54d2d7f287357b…

MALICIOUS

PDF

75.5 KB Created: 2021-01-02 04:53:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b272fb8ed0c7f578271f9bca8985209f SHA-1: 7c5b030229450fad0dfc7cc02af2e37ea7415c44 SHA-256: 9c54d2d7f287357bebba15098297d09986ba4e9d6ae188dad6c9c8d2a7513242
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically disguised as a download for 'Diablo 2 patch 1.14d'. Heuristics indicate a link farm designed to redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://traffmen.ru/123?utm_term=diablo+2+patch+1.14d+download In PDF document text
    • https://fologonalufofu.weebly.com/uploads/1/3/4/6/134694067/7428eefd5875a8e.pdfIn PDF document text
    • https://bedaruwi.weebly.com/uploads/1/3/5/3/135326402/1804578.pdfIn PDF document text
    • https://cdn.sqhk.co/dodiniwotud/ckkzEjf/getabejubawudipade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379229/normal_5f95dc615c086.pdfIn PDF document text
    • https://fudukonuxevefez.weebly.com/uploads/1/3/4/6/134606022/kuxesixuxipopazipemo.pdfIn PDF document text
    • https://zududebagulakes.weebly.com/uploads/1/3/3/9/133997448/jotetozewedodejikuf.pdfIn PDF document text
    • https://cdn.sqhk.co/judebivon/NgijcDu/63605280130.pdfIn PDF document text
    • https://gumomamomav.weebly.com/uploads/1/3/1/3/131398069/5b75b.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/ziwuvijevo/45944939003.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/144c0f48-3755-4047-91ae-23a1c16ea64d/psychology_101_exam_2_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4578f829-31db-44f7-abe9-51f26a5959c9/sim_card_toolkit_unlock_chip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f94a119e-0a0e-4697-89c0-9c433976acf6/36471649096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a70f999b-a30f-44f6-8bca-53624b5e9f8a/22_clues_level_30.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_off0000e87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 5424 bytes
SHA-256: a036aa38ca010e7b6a0f283d8f71cb6b9474dd96e6e77c92242e208adfd8e218
font_01_sfnt_off0000fb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB09 11172 bytes
SHA-256: 6a1325d0f991474965c487695dbf977f96b83db4dabddcf4d587d0ac23a2ad86

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