Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd83402daa717ace…

MALICIOUS

PDF

79.9 KB Created: 2021-03-28 09:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 26206b5ebdd33ce8b4ba2f2966f10363 SHA-1: d63dcc51a1c8aa6e9132ad682851740fdcd938ef SHA-256: dd83402daa717ace65b8b8f73be1e5adc0b7994ec844f4059a4a816c2092ae94
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded links, many pointing to disposable hosting, and the document body text is obfuscated and likely intended to disguise the malicious nature of the links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a phishing or scam attempt by leveraging a large number of links on low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/award?keyword=physiology+of+hearing+steps+pdf PDF link annotation
    • http://helplnstagramcontact6088756.com/605033240724vdpb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403951/normal_5feba62e79878.pdfIn PDF document text
    • https://zomudefe.weebly.com/uploads/1/3/0/7/130740133/4001516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473616/normal_60561dc785620.pdfIn PDF document text
    • http://bevarep.22web.org/cinderella_1950_dual_audio_720p.pdfIn PDF document text
    • https://zemizipip.weebly.com/uploads/1/3/4/0/134098502/7753325.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/33521525949.pdfIn PDF document text
    • https://wukajimodowel.weebly.com/uploads/1/3/0/8/130874313/d621d6f8caf1af.pdfIn PDF document text
    • https://kukurako.weebly.com/uploads/1/3/5/3/135321284/masokewesotuw-bamibodobewas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402717/normal_605feb959f82c.pdfIn PDF document text
    • https://wajumasilikat.weebly.com/uploads/1/3/4/1/134109139/nitebijatusis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383321/normal_6025c89dc776a.pdfIn PDF document text
    • http://beamorem.com/nudidojoximekizevokifafox0nnif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368956/normal_605822e1e65b4.pdfIn PDF document text
    • http://krokoboko3.xyz/574190164725iv24.pdfIn PDF document text
    • http://kprovk.xyz/what_is_self_managing_learnerf0469.pdfIn PDF document text
    • http://sogixusi.medianewsonline.com/personality_test_games.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_5155fb04163f483997e1c11d3bd346d8.pdf?index=trueIn PDF document text
    • http://wisokokeg.epizy.com/denogibatisebowitatebu.pdfIn PDF document text
    • http://milebulijulami.onlinewebshop.net/41802902489.pdfIn PDF document text
    • https://7722bba5-72ad-4d15-a72d-9ce9fbdcf1b5.filesusr.com/ugd/772ad5_0027a3adee594f909d18531ecb017a49.pdf?index=trueIn PDF document text
    • http://talakukatutevib.epizy.com/11052900558.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 5408 bytes
SHA-256: 8f007dfd88cf8ecc1988633a94b34fc48f8f9636eacc9fe6cd55ba81622aea61
font_01_sfnt_off00010d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5F 10800 bytes
SHA-256: d2817e17cf75f6fc9bd268c204efe0a21bd1bcbaea358b712da1f257fff2b8f0

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