Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d7d3fcdc777290…

MALICIOUS

PDF

43.0 KB Created: 2020-11-06 20:35:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 531d864fb98350f5e092fc75383e427b SHA-1: 176fc9fcd9f604e7075a7abea40c6f4acd534e4d SHA-256: d6d7d3fcdc7772905daea1decd13f47cf0493a7235091aaa93102a300fa73253
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a link farm and callback phishing lure. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with one pointing to 'https://s3.amazonaws.com/wopari/95935210930.pdf'. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a phone number, a common tactic in tech support scams or refund fraud. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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?keyword=plain+dealer+obituaries
    • https://cdn-cms.f-static.net/uploads/4406229/normal_5f9ab6ab1196f.pdf
    • https://gulijigomun.weebly.com/uploads/1/3/4/3/134350957/4521324.pdf
    • https://cdn-cms.f-static.net/uploads/4383327/normal_5f8b8f3f1d04c.pdf
    • https://vomilanusasapik.weebly.com/uploads/1/3/4/4/134478463/626364.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wopari/95935210930.pdf
    • https://uploads.strikinglycdn.com/files/43375768-ef8b-4a9e-ad84-74c44b07e270/watsons_go_to_birmingham_questions_and_answer.pdf
    • https://s3.amazonaws.com/muvemasoxaji/ncert_9th_math_book_in_hindi.pdf
    • https://uploads.strikinglycdn.com/files/bf239c9a-e0fa-4432-9d7a-dff1107609f7/73895584117.pdf
    • https://uploads.strikinglycdn.com/files/f51b10d5-10a6-4faa-9821-49586e91b087/wimekejemujejigubupeju.pdf
    • https://uploads.strikinglycdn.com/files/6647ac62-7d08-4df5-aef5-089a313009d8/75698296973.pdf
    • https://uploads.strikinglycdn.com/files/7652b43b-4014-4eb3-b5c3-5afdfee5f922/22326892347.pdf
    • https://s3.amazonaws.com/farezelof/practical_english_usage_swan.pdf
    • https://s3.amazonaws.com/suximawo/cordis_central_line_cpt.pdf
    • https://uploads.strikinglycdn.com/files/721ac2cd-5499-4a4b-8158-22eb8799ade5/lisuwupefe.pdf
    • https://s3.amazonaws.com/mafavuzenoliki/cute_pedicures_for_spring.pdf
    • https://uploads.strikinglycdn.com/files/55d128e6-2b2d-42cd-b68f-fba14c4af1d4/46885446245.pdf
    • https://s3.amazonaws.com/fosagoba/noges.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cc1.bin
71a2e36dc1578229ead991f2b5e4f1354ccbed43d3d454450d5d9a610d5b2479
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CC1 4840 bytes
font_01_sfnt_off00006d2f.bin
8a42bd687364f9124ef9ed8e9c5dd01a8f314f8320d0df3d22f6a1fce6d1d907
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2F 10492 bytes
font_02_sfnt_off00009118.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x9118 4324 bytes