Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d9fee72a5726f4a…

MALICIOUS

PDF

70.0 KB Created: 2020-12-03 18:50:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 88faf530bd010d7453fb285134eac3cc SHA-1: 6cc59dbcf7f6dacc0cb0818920088cc2c0fe18a8 SHA-256: 2d9fee72a5726f4a4a204a754333eda92eaf259c259511255e910b6a518dfdc9
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://trafffe.ru/strik?utm_term=712+credit+score+mortgage+rates PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380871/normal_5f92abaf8f3db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_5fbb48274461f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483851/normal_5fc5ad4887854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424689/normal_5fbe789fdba13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410730/normal_5fa031c4b13f0.pdfIn PDF document text
    • https://fofifakexetag.weebly.com/uploads/1/3/4/3/134345684/5404376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386830/normal_5fbcc3ac3f80a.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/7a55550d-a80a-4fa8-b61c-56fe72ba186d/92254629786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bbf97e4-d957-47db-9532-65882ac537cd/vuvovefodakinujinolawakej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd7a60a3-087f-4b25-ab90-3e83efc306e3/67575532099.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b24ac995-a57f-45dc-80b2-49491b5c6c65/42823789082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f65a6a14-0704-47c7-b9a1-795a6b8d94c3/waxozovubegi.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_off0000d4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D4 5396 bytes
SHA-256: 4a151565b841e74f0f3f4a506e5d39fabdf53d1bf119195705bc6c73b67c8c1c
font_01_sfnt_off0000e71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71B 10608 bytes
SHA-256: cf3501b3cf896d31f5f66c9c2da6898e47bda22ae066c75e01742ec182cb5d2d

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