Malicious PDF — malware analysis report

Static analysis result for SHA-256 136881e2dae346b4…

MALICIOUS

PDF

74.0 KB Created: 2020-12-19 21:10:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25844756f6247494103aa569b5da2957 SHA-1: d2ef90baa66dd8d452e4400ea64435758e9b281e SHA-256: 136881e2dae346b49b8077fd8b75d76098567f9b252e402ad10b17c89760b651
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to direct users to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external URLs indicates a phishing or content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=invertebrates+exhibit+radial+symmetry
    • https://lelewamopubexab.weebly.com/uploads/1/3/4/3/134324934/6362170.pdf
    • https://danawejenig.weebly.com/uploads/1/3/4/4/134499985/sikosez.pdf
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5f9b6d6d6b3bb.pdf
    • https://cdn-cms.f-static.net/uploads/4445864/normal_5fb609a9c3d63.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xanebavifamopez/61434046911.pdf
    • https://static1.squarespace.com/static/5fc0dde9d26ff1194f7385b9/t/5fc544a018e72e5fdb84c4c6/1606763680991/industrial_vacuum_sealer_for_meat.pdf
    • https://s3.amazonaws.com/zafirawit/atoms_elements_and_molecules_warm_up_answers.pdf
    • https://static1.squarespace.com/static/5fc6448340f1034a5ccd57f3/t/5fcf92d876f3eb1a46e90915/1607439064671/car_crash_simulator_game_unblocked.pdf
    • https://s3.amazonaws.com/mesixadelomomo/rust_eco_raiding_guide.pdf
    • https://s3.amazonaws.com/bisegilupuf/wunogof.pdf
    • https://s3.amazonaws.com/jefazaxal/interrogative_pronouns_worksheet_for_grade_4.pdf
    • https://s3.amazonaws.com/tosego/jesewoni.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_off0000db9e.bin
d51922c110b91b8bc13e3c1d14dec2bd559001df1d3c82c550261a7d0d5d37d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9E 5052 bytes
font_01_sfnt_off0000ec90.bin
0fd2e3f5237606d892eab352325c8eb1ff0e7c8ce2c3d3bf1a70a863ae845a33
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 9548 bytes
font_02_sfnt_off00010d2e.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2E 4324 bytes