Malicious PDF — malware analysis report

Static analysis result for SHA-256 405a42ec964bf862…

MALICIOUS

PDF

72.4 KB Created: 2021-03-31 12:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 5b1fe07539958e6c95b855e0acb6910a SHA-1: 8cafb94cdbae7e6b313184aa1b244e6ac863f437 SHA-256: 405a42ec964bf86275ca94b01d3b4dfafceef5cd75a2e650f09672227f3b566d
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm hosting numerous PDF files. The embedded URLs point to domains that are likely part of a phishing or malware distribution scheme, aiming to trick users into downloading further malicious content. No scripts were extracted, but the overall structure and URL patterns suggest a phishing or malware delivery attempt.

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/award?keyword=biodata+pdf+free+download PDF link annotation
    • http://best-store.club/how_fast_is_a_yamaha_fz6o471y.pdfIn PDF document text
    • http://wugegifa.getenjoyment.net/ornamentation_in_architecture.pdfIn PDF document text
    • http://itravelimpressions.com/can_i_activate_my_proform_treadmill_without_ifit3brrb.pdfIn PDF document text
    • http://xomunuxeju.sportsontheweb.net/36631002576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427498/normal_6054c81889879.pdfIn PDF document text
    • http://vinnipoh.fun/edu_science_telescope_70-700_how_to_usekxy1y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421627/normal_5fd66373e6cef.pdfIn PDF document text
    • http://verenica.net/church_information_signsdszki.pdfIn PDF document text
    • https://cdn.sqhk.co/pudamunipum/0jfhaic/88387291655.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/ieigGjj/30749554455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495392/normal_604d3275324f1.pdfIn 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
    • https://uploads.strikinglycdn.com/files/dc0e4107-0960-4f01-abb1-439f03b53ef4/xugukabog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd094bb7-11c6-40f8-8f5f-f3592880b4e4/free_crossword_puzzle_maker_download_for_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d40cfd4b-f8d3-4919-bb72-236884bce031/vijiparimebuk.pdfIn PDF document text
    • http://benifolagalat.epizy.com/inorganic_official_compounds.pdfIn PDF document text
    • http://makowadoka.epizy.com/home_touch_steamer_stopped_working.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_off0000d30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30A 4784 bytes
SHA-256: fbb95043cc63b931f4343920750add47b0c830f1a612609501a4c16fb3d03574
font_01_sfnt_off0000e367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 10348 bytes
SHA-256: 29495b99e91e33aa563b5fdfbf6d9d9281a87acd956a565166eea17769bb412f
font_02_sfnt_off000106a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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