Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a935ef463be43d…

MALICIOUS

PDF

71.5 KB Created: 2020-11-25 11:44:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5eb78a666e65430856385ebeecf60cae SHA-1: db5e0e8450bae5a50f06cd8d658303ad5e9ae8fa SHA-256: 63a935ef463be43d934da53eba1e9ec71b264fa8eb6d461e1df18cc8c5414762
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/strik?utm_term=rp+codes+generator PDF link annotation
    • https://wozofawado.weebly.com/uploads/1/3/0/8/130874325/gifakazov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367640/normal_5f8b3f0d4a9ab.pdfIn PDF document text
    • https://bawigadumifop.weebly.com/uploads/1/3/4/4/134494387/85f858e5cc8b.pdfIn PDF document text
    • https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/badimekudanam.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/lusuxi.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/litunux/singer_191d-30_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9e2fbf8-1b64-4684-92aa-3802cb8bd118/paxulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b740f4b-18f1-4065-96e0-a54b770f7d2f/45795385357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e9e33e9-4126-4226-a048-93d68579797a/xezuzubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91838899-0837-436f-889f-f36d38d7357a/tujupop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d47bf7e3-0b8e-4f92-b788-430c0edfd339/bibliography_style_latex_apa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dabe05b-5a31-496c-9102-f2bc8abad45b/libim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2764035-8575-4d89-971a-002ed3afda02/wejazatezizasipabovado.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_off0000d996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD996 5216 bytes
SHA-256: 25b4d13d6e884c24d53f396ae25084ed539140d3c469138a12e43b40304989d2
font_01_sfnt_off0000eb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB68 11344 bytes
SHA-256: 852607289612700e8588e4c0fce475736adcdb365046a99c8ea4db16fd73e88c

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