Malicious PDF — malware analysis report

Static analysis result for SHA-256 961477f73adaf2e0…

MALICIOUS

PDF

72.9 KB Created: 2020-11-24 05:19:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ab26b90dcae29b0ec8e3b4329f92e277 SHA-1: b7ed7cb947a4cbe2fd685fe84fcb28c1f961c24d SHA-256: 961477f73adaf2e08d3ff2c1e299e7e180d98300634c8cb0b4c262702d8f70c6
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 0.9997

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://traffnew.ru/strik?utm_term=nds+games+downloaden PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457279/normal_5fa5d2f636f9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380211/normal_5f9f8f52dc4b8.pdfIn PDF document text
    • https://vujedivu.weebly.com/uploads/1/3/4/7/134768767/1bef97b0b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413848/normal_5fa8f202f1adf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368237/normal_5fa2b3871cace.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_5fbc44ba49087.pdfIn PDF document text
    • https://kanolapegagidil.weebly.com/uploads/1/3/4/3/134339460/jomuliruken_waxexazurature.pdfIn PDF document text
    • https://sibovobum.weebly.com/uploads/1/3/4/8/134879451/c34a14e02.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/nezanurugega/office_administration_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a20eb948-26be-4fb5-82a0-15da0c66e462/fovarodovazidim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e362d0c-e15a-4522-8cab-53ce45ed17fb/simoxugomagej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/364e0505-83e9-4f0a-9654-5539f3fef3a1/35141999588.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_off0000e13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13A 5108 bytes
SHA-256: 8b395e880145cb1e109b633167c54977684afd999d6fa392d92b96f20e9f8ec8
font_01_sfnt_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 10824 bytes
SHA-256: 04f75cd523f04c0de69b2d0add8f31e073f0378a611598b863d4484cd3c3ee2d

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