Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7a02ed1a1c7020…

MALICIOUS

PDF

45.3 KB Created: 2020-11-05 20:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 566aface3ffdf5d19768d7f2f1da24ba SHA-1: 1992b6ec3b88780d4e528a8d6a11a22079e2b5ce SHA-256: da7a02ed1a1c70203f2e651c19cef2344a794c955560e489bbbba7f49d728099
66 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains numerous embedded URLs. One heuristic specifically identified the PDF as a link farm on disposable hosting, suggesting an attempt to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the presence of multiple external links points towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafftec.ru/123?keyword=when+genius+failed+lowenstein+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5f88d953807b6.pdfIn PDF document text
    • https://moxitason.weebly.com/uploads/1/3/4/3/134384587/loratun.pdfIn PDF document text
    • https://wukodotimage.weebly.com/uploads/1/3/4/4/134487216/2559810.pdfIn PDF document text
    • https://refanoripusegu.weebly.com/uploads/1/3/4/3/134306014/kimutubuzo.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/5606f26d6e6.pdfIn PDF document text
    • https://zozolexiwu.weebly.com/uploads/1/3/4/3/134343356/gonofebevozuvam.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/bef650e6-5d0d-4e34-93db-231f6307e373/zowofusexumupatebewakeg.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/zirasefubikup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/146edf8e-7965-49d1-a6cd-ebfa9fbfcfe9/61718681054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a15308d3-a7e5-4fa3-a8b2-84ff6cb2dc30/45800388013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d03f0672-35f5-4278-ae19-be0e86f3935d/mvp_superlift_3_ton_floor_jack_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f165c3a2-6bb4-4f13-85a5-ce6dd8fedd1d/fexowe.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/71558579917.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_off000070b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70B0 5312 bytes
SHA-256: 7875554d6b830f98ffc980a564c116488abd93b9be993ffb78a10d9f205ac7d1
font_01_sfnt_off000082e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82E7 11052 bytes
SHA-256: a89aefdc05b8b3fd7c734f811eec914a70054b0e7a92706bc2c0d13996913f0a

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