Malicious PDF — malware analysis report

Static analysis result for SHA-256 609823debe283f75…

MALICIOUS

PDF

83.7 KB Created: 2021-05-18 22:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1d3d90fb8fe7d0028fd3611abe3977b2 SHA-1: c466c762234f4d947cf8d536b8668d6d93fd44cf SHA-256: 609823debe283f751caf31f6218b4b089ad74fe9a51895f72f0ea9c86b824125
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a primary external URI pointing to a suspicious domain. Heuristics indicate it functions as a link farm on disposable hosting, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=clima+laboral+libros+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445331/normal_5fce8bde1141b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450043/normal_6056e7b24a056.pdfIn PDF document text
    • https://memugili.weebly.com/uploads/1/3/4/5/134526503/7011440.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482636/normal_600c61c76957f.pdfIn PDF document text
    • https://rokosogamutoluf.weebly.com/uploads/1/3/0/8/130873735/c3cca.pdfIn PDF document text
    • https://saduzoxizujakef.weebly.com/uploads/1/3/1/0/131071125/kebin_gufel_vujovopulabata_mabizaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376610/normal_602ea89cd21ce.pdfIn PDF document text
    • https://mubuzetuwifo.weebly.com/uploads/1/3/4/7/134703000/serixodotigigiki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/65481590375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15f1bea2-0cdc-401f-9f88-a78d65a8c0d4/40436864046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d980e84d-ba03-4ded-bd61-cc795fd7c225/34974290779.pdfIn PDF document text
    • http://vonibuvet.rf.gd/72667082884.pdfIn PDF document text
    • http://pebafuduzuxifa.rf.gd/flubber_movie_questions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/3760611866.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/zolopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b54d197-3750-459d-904c-ea2f3f270fc9/zuzazelutiminepekigoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27b1199b-fa50-4807-b82b-3c21e0aff6bb/wogose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2043cba8-0c6e-4279-8b66-88049c51198e/buxebawegekuwarekuwevuv.pdfIn PDF document text
    • http://xutakubu.epizy.com/answers_to_crossword_puzzle_today.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C0 5232 bytes
SHA-256: 8cec770f55a1984a80240fb56b75d9d0e58e425203e49a75ed1a1757528d34a8
font_01_sfnt_off00010b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B58 3096 bytes
SHA-256: c75e53e5376bb524ffd9d684434f343445f0154208e3a45a8a2ad8e7ac8a82a9
font_02_sfnt_off00011836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11836 12300 bytes
SHA-256: c193492cea756c4c3d69110e6bf63cbcf623a7f1906361576892f6bc75d9914a

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