Malicious PDF — malware analysis report

Static analysis result for SHA-256 d922f16fe1c59a48…

MALICIOUS

PDF

70.3 KB Created: 2020-11-22 16:18:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 05937400245e27b22940344a1682ad3b SHA-1: 18565f1cd707d17b936bbbb6fb59394eed815a19 SHA-256: d922f16fe1c59a48c666d87009e10898a113ca7d8fd3557277be560bca95c4a2
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating a phishing or trojan-like behavior. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary URL observed is https://traffset.ru/123?utm_term=the+standards+real+book+c+version+pdf, which likely serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://traffset.ru/123?utm_term=the+standards+real+book+c+version+pdf PDF link annotation
    • https://popakute.weebly.com/uploads/1/3/4/8/134863009/mupizudixuxojegixika.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5f8c94cabce61.pdfIn PDF document text
    • https://dedezeke.weebly.com/uploads/1/3/4/4/134494225/5347412.pdfIn PDF document text
    • https://pesegoniz.weebly.com/uploads/1/3/4/4/134497823/5664488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_5f8d286244b0d.pdfIn PDF document text
    • https://judunelikirolo.weebly.com/uploads/1/3/4/3/134375477/fa7a78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467036/normal_5fa4bb9c0ea31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391302/normal_5f91fce89be61.pdfIn PDF document text
    • https://naduwabale.weebly.com/uploads/1/3/4/6/134651235/kumojikonijovut.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/599ad8d9-386a-492d-9be0-b6c2961e4479/kutojilulavuwovipufiparu.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/13736553506.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/mackie_sr24.4_manual.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_off0000d477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD477 5456 bytes
SHA-256: 6a423a7047f86519f4f8949b234d1f8ebd461ae760e661ee7e557327e4ab7e95
font_01_sfnt_off0000e702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE702 10968 bytes
SHA-256: e2dd88ca2e669009cf537b5f0af4a0e303ada11e0776c9eabde913f860aa04bb

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