Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e81c93680a725a7…

MALICIOUS

PDF

72.3 KB Created: 2020-12-22 14:56:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6f80237454d39163314cf9728e9286a SHA-1: 76fd38cceed3699c3dbfcf1eb3a61a1d46795ed9 SHA-256: 6e81c93680a725a7b3b0845ab4855b4aa2266ec292ece7813745dba0a2101fe3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicated by the 'PDF_SEO_LINK_FARM' heuristic, with one prominent malicious URL being 'https://trafffi.ru/123?utm_term=evil+barney+gets+grounded'. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm the malicious nature of the file. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to potentially malicious content, aligning with phishing or SEO abuse tactics.

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://trafffi.ru/123?utm_term=evil+barney+gets+grounded
    • https://xivimuwujaka.weebly.com/uploads/1/3/4/4/134440816/2441962.pdf
    • https://jezitazosebizag.weebly.com/uploads/1/3/4/7/134700096/2796375.pdf
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/bisesegolalobiwofipi.pdf
    • https://kerijene.weebly.com/uploads/1/3/4/3/134367262/1d3f8938d.pdf
    • https://wakevilapiz.weebly.com/uploads/1/3/4/9/134903367/fizukixeme_matewujoda_razox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/c25d48ec-d6d8-4b05-96e0-237a3af79d37/zimowijijisapatunodajit.pdf
    • https://uploads.strikinglycdn.com/files/c1810416-340a-4065-9549-94c30c022da8/home_depot_seeds_program_login.pdf
    • https://static1.squarespace.com/static/5fc1b24012facd59ceb28ac7/t/5fc54162e6d49a06bb3f357d/1606762850445/tu_vung_tieng_anh_cau_hoi_tra_loi.pdf
    • https://static1.squarespace.com/static/5fdcb8173599a867de449200/t/5fdcc27b5fd8956ebac1456f/1608303228790/karl_storz_annual_report_2018.pdf
    • https://static1.squarespace.com/static/5fdcb81cb919dd0c3e451148/t/5fdcc3dfeb376540435c5aa0/1608303584395/gomaw.pdf
    • https://static1.squarespace.com/static/5fdd53b4d610986319753e28/t/5fdd87876a6ad7222f03989a/1608353671583/quiz_questions_with_answers_in_bengali.pdf
    • https://static1.squarespace.com/static/5fdec0a62dcd53187f2068e5/t/5fdf76b1a3b92b153c384d22/1608480435426/9679726696.pdf
    • https://uploads.strikinglycdn.com/files/32a0071d-1c78-4617-9c05-5d3ce71e0956/5e_the_traveler.pdf
    • https://uploads.strikinglycdn.com/files/b1a62075-0343-40d1-8304-eb08564d1614/pisogubageges.pdf
    • https://uploads.strikinglycdn.com/files/25a28ffb-4b0e-45c7-b47f-817b131158c8/cytoplasm_and_cytosol_function.pdf
    • https://uploads.strikinglycdn.com/files/9fe0cd09-44a2-42eb-b720-5cea522f7971/89527783150.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_off0000d1ab.bin
27067c4284f2936a6665e2aef90b607f5a03f2b6b9a4e177afee95861d71ca5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AB 5136 bytes
font_01_sfnt_off0000e32b.bin
4abb5d2cfc61497cbcd9852437c9e919c2fecd39c3c62ba841c85666b98c3fb3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE32B 10144 bytes
font_02_sfnt_off00010612.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 4324 bytes