Malicious PDF — malware analysis report

Static analysis result for SHA-256 631a99eeedcbd9b0…

MALICIOUS

PDF

69.8 KB Created: 2020-12-31 22:05:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8c09a3511668d9b66ab551ff2ff34229 SHA-1: ea94ad3da5bd9c6650845f4f53770669b2fc0ec5 SHA-256: 631a99eeedcbd9b055e9e0b1c7b2faed77211b5cf96b95896290b068e06d1563
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one specifically identified as a redirector on disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffking.ru/123?utm_term=eel+river+fishing+guide PDF link annotation
    • https://cdn.sqhk.co/pitewomepe/CjhxefS/xebikilukapilijojowelefav.pdfIn PDF document text
    • https://rizidapovo.weebly.com/uploads/1/3/4/3/134316848/703653eae.pdfIn PDF document text
    • https://soguleta.weebly.com/uploads/1/3/4/3/134305846/f27a785b4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492275/normal_5fc18573d7e19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402948/normal_5fed5b2743de3.pdfIn PDF document text
    • https://kawewadibuporak.weebly.com/uploads/1/3/4/3/134371142/20147.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/tobobowu/76589047393.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/83820062951.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/hello_tune_app_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d39f72b-fb64-4514-8582-8e6a58cb136c/download_age_of_empire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07d422f8-b5e4-4f36-ad91-9d0a95b09f9b/ti_84_online.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_off0000d6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AE 4976 bytes
SHA-256: e74535fee0906c40b5dff3b44f5d2a0d8015daafa74e9e02239914ed3164a605
font_01_sfnt_off0000e7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A5 10428 bytes
SHA-256: abce935affc102b53f166ea325476d1cfdacfdb914c98249b64ef889a845dac7

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