Malicious PDF — malware analysis report

Static analysis result for SHA-256 869da212f806c948…

MALICIOUS

PDF

79.3 KB Created: 2021-01-08 06:31:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0394ae7813f031e4fc2cb40fd774fd21 SHA-1: e73aff6309843234c05e9e932cbedf4cc1008a43 SHA-256: 869da212f806c948a94f5490f266ae961c7f6ef080642be172a65eca7b0e1f8d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking PDFs, but one prominent URL points to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution disguised as a parts manual. No scripts were extracted, but the PDF structure itself is used to host numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=john+deere+348+baler+parts+manual PDF link annotation
    • https://finijuzado.weebly.com/uploads/1/3/4/4/134444754/winexemi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368985/normal_5ff447d7d2396.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417023/normal_5ff7ca7e39a26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479925/normal_5fab390544fa7.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/13908f12-cdc0-4dd3-b49b-b194a1df915c/97555423709.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/1262029328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ccc3563-c473-4fd5-b1d2-18442d95e31f/sofusijikuruzid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0708a424-c51a-4f38-a7d2-69295c60aec7/national_educational_television_dirty_logo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4608db55-fd76-4436-ae72-23ce04e3ce70/35658454246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f6ca3a7-63d6-4d90-b21b-cd85ca851d3f/46277518788.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_off0000f7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C4 5776 bytes
SHA-256: 7159bd5697c6d81d32abbc424aac908dea770c571e9e6b3ae3aa44feaf0d8617
font_01_sfnt_off00010b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B38 11156 bytes
SHA-256: cb55baeda471654417f6b2b76a3f9c138883db75c2ef2ba50ff1b0460ea70a91

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