Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdacd3d686a503db…

MALICIOUS

PDF

68.9 KB Created: 2021-02-14 07:44:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ff6702ee5d551f7f1386aa25ea4b69ed SHA-1: 1bf962b77dba5368c350c5b6559c875471e9c16c SHA-256: fdacd3d686a503db4c6512f877fec04791fe0defc4fa8e399f0654c1b963e401
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs suggest the document functions as a link farm, likely directing users to phishing sites or further malware downloads. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=the+224+valkyrie PDF link annotation
    • http://skameyki.club/piparuwikbq8ps.pdfIn PDF document text
    • http://custits.space/sulisukixejojafoxufupirfu6.pdfIn PDF document text
    • https://xedaloroxolujig.weebly.com/uploads/1/3/4/0/134018039/togonekepu.pdfIn PDF document text
    • https://cdn.sqhk.co/xijodepub/iQ04zhh/lujitagizode.pdfIn PDF document text
    • http://zeropium.com/538872060519q2h9.pdfIn PDF document text
    • http://reduslim-eu.site/let_it_go_piano_sheet_music_beginnerdm5sz.pdfIn PDF document text
    • http://floradoma.net/84346739012bvmxz.pdfIn PDF document text
    • https://cdn.sqhk.co/disidudi/hPihf60/ranking_mejores_arcades.pdfIn PDF document text
    • https://fumaletaseker.weebly.com/uploads/1/3/1/3/131381433/7549939.pdfIn PDF document text
    • http://idealica-italiauficiale.website/32398678887bfzbh.pdfIn PDF document text
    • http://webmastervlad.ru/anemia_perniciosa_hemogramae6yw4.pdfIn PDF document text
    • http://copyrightprivacy.site/revenge_of_stickman_warriors_apk_modflnnz.pdfIn PDF document text
    • https://magudutetu.weebly.com/uploads/1/3/1/4/131437318/rarugusagapi-peguwem.pdfIn PDF document text
    • http://womenita.fun/samsung_galaxy_tab_emulator_android_studiowyfk9.pdfIn PDF document text
    • http://snatural.space/132272955233234q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD100 4988 bytes
SHA-256: 0f99796ce26af4b90513542c00dc1d8b1c8f72874ac8b41a72686e4a304269e9
font_01_sfnt_off0000e1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FE 11036 bytes
SHA-256: 3aa7b898669a4f80a2ce29c21e7a67322315b136d73cca12e7ead2ed9114a523

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