Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c684964679cd8f3…

MALICIOUS

PDF

68.5 KB Created: 2020-11-24 22:17:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d8662aa90a244d450756cde5f8a854bc SHA-1: d2fc9aa67f2f10426694cf240e439743cedb637e SHA-256: 7c684964679cd8f3a426ac48c6e4f94ce041774d107ddfa33b77c9daf85184f5
214 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious. The embedded URLs suggest an attempt to lead the user to phishing or malware download sites, likely disguised as a free novel download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • 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://cctraff.ru/strik?utm_term=how+not+to+write+a+novel+pdf+free+download In PDF document text
    • https://fawefugixizim.weebly.com/uploads/1/3/1/3/131383791/xoloru_pekuzen.pdfIn PDF document text
    • https://tupipukevoluda.weebly.com/uploads/1/3/4/0/134041298/fefilifuvo_sofitepaseko_kupisede.pdfIn PDF document text
    • https://tejojapifofomo.weebly.com/uploads/1/3/4/3/134339563/zuzopikizam.pdfIn PDF document text
    • https://zadujemerumid.weebly.com/uploads/1/3/2/6/132695269/908035.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/44b2c6c.pdfIn PDF document text
    • https://paxobafu.weebly.com/uploads/1/3/4/6/134697986/2280254.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/9c00f3b6-6481-4752-a684-778e1aa4e208/retedu.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/mod_apk_huuuge_casino.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/fish_worksheets_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/juxatop/wyoming_department_of_criminal_investigation.pdfIn PDF document text
    • https://s3.amazonaws.com/mupakijivuruzim/gukipuguj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1cb90cb-1f02-4c53-9c38-867c420ce951/67003414511.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/hashmap_python_add.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/cinema_4d_materials.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/fizabimoz.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/shakespeare_and_elizabethan_england_webquest_answer_key.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_off0000cfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDB 4972 bytes
SHA-256: 88047f8cbabdb8419e57e0531748a2891cfc95919df77c5ffb730c2e8266fdb0
font_01_sfnt_off0000e0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EB 10000 bytes
SHA-256: 65c624f570052d60c1d43d2d3ee555840291487f3066823449ca2236c5fb1012

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