Malicious PDF — malware analysis report

Static analysis result for SHA-256 952da2379f3beb24…

MALICIOUS

PDF

101.2 KB Created: 2021-06-05 11:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 03df058527095f1c5d5af1f7278a9a86 SHA-1: fcef77e29e5b78cd2e6a2e5f00c6638a208dab0f SHA-256: 952da2379f3beb245f41966fcbda6ffb3fb41ac6ee13724866853e8a3a4758cc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or lead users to phishing sites. The presence of external URIs and a link farm heuristic supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/pbw?utm_term=ejercicios+resueltos+de+aletas+transferencia+de+calor+cengel PDF link annotation
    • https://baxodibidixajit.weebly.com/uploads/1/3/5/3/135311382/a2386ace9e295b.pdfIn PDF document text
    • https://funebaxap.weebly.com/uploads/1/3/4/3/134399245/xarel.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sofutikajen.pbworks.com/w/file/fetch/144456048/vazipajudoj.pdfIn PDF document text
    • http://muzupusap.pbworks.com/w/file/fetch/144649203/tangram_figuras_para_nios.pdfIn PDF document text
    • http://foziwedugumu.pbworks.com/w/file/fetch/144448959/48803754019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85fc3645-fb5c-4457-baa2-f29cfb65942e/99021567612.pdfIn PDF document text
    • http://pudamalulera.pbworks.com/w/file/fetch/144556167/jarafadobuxo.pdfIn PDF document text
    • http://wemilamozede.pbworks.com/f/5366835172.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144412446/69957912064.pdfIn PDF document text
    • http://tarogifere.pbworks.com/w/file/fetch/144564648/34111676085.pdfIn PDF document text
    • http://wisarazed.pbworks.com/f/dabitetosis.pdfIn PDF document text
    • http://jiboduxoguv.pbworks.com/w/file/fetch/144507261/how_to_get_dataflow_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88d61c12-a742-4757-8805-33ebe131ccb5/75492515041.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/w/file/fetch/144516189/4591584209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ec5f722-c8d0-478a-854e-1769191cfb80/livazu.pdfIn PDF document text
    • http://sutodoromar.pbworks.com/w/file/fetch/144489468/tagalog_movies_free_online_watch.pdfIn PDF document text
    • http://kimotamiju.pbworks.com/f/tobudak.pdfIn PDF document text
    • http://fuvotobike.pbworks.com/f/simple_present_tense_exercise_with_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cfa9334-fd8a-4b5f-9eba-ab28c9e7c4b7/jump_rope_challenge_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/133174ed-e49c-443e-9fd5-46f261992b90/vafemubup.pdfIn PDF document text
    • http://gediripu.pbworks.com/f/fl_studio_amapiano_project_files_zip_free_download.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12714 7852 bytes
SHA-256: df5ec99679c245ee8dee40a17395856575f1991adb399af08278e0f9accf2848
font_01_sfnt_off00013d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6C 5104 bytes
SHA-256: dc0698ffe0cb5d5bb4683ca0ac5f23acce067486a01dc199bde53a81d0ddd45a
font_02_sfnt_off00014ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED9 12264 bytes
SHA-256: 005d881bf481bf6540fff99ef08bbb8fdb14a53dfd6adac0d69201e11583b491
font_03_sfnt_off00017617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17617 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230