Malicious PDF — malware analysis report

Static analysis result for SHA-256 843386ef9b40c661…

MALICIOUS

PDF

85.2 KB Created: 2021-03-05 12:36:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 353ca579f4275294f7a7d43971935ea9 SHA-1: dceedec20a12567d01c7e923b9cbf2ee06492c80 SHA-256: 843386ef9b40c6616d02675a06569a2f3ea3817dcb49d36f715fea201f4b55a2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam tactic. The document body, though heavily obfuscated, contains references to 'saint spyware generator' and metadata indicating it was generated by wkhtmltopdf, which can be used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/wix?keyword=saint+spyware+generator PDF link annotation
    • http://dehydratedoriginalgoodness.com/574297110893sbvp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485927/normal_602035991857f.pdfIn PDF document text
    • https://nedixizudunosil.weebly.com/uploads/1/3/1/4/131483200/3128559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458428/normal_601146c7bbf9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445130/normal_6009d435c700e.pdfIn PDF document text
    • http://ooovseanalizi.ru/five_nights_at_freddys_1_free_gameplayofswo.pdfIn PDF document text
    • https://cdn.sqhk.co/dowusutitozi/ihmG0YL/real_car_parking_2_pc_indir.pdfIn PDF document text
    • https://cdn.sqhk.co/sexipemajim/Qrgdrhi/kendall_kylie_jenner_fight.pdfIn PDF document text
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/6712234.pdfIn PDF document text
    • https://vulalubog.weebly.com/uploads/1/3/4/8/134862436/binaneb_povew.pdfIn PDF document text
    • https://milixugaxezo.weebly.com/uploads/1/3/1/8/131856079/4028181.pdfIn PDF document text
    • https://giretalude.weebly.com/uploads/1/3/4/6/134677333/5209020.pdfIn PDF document text
    • https://cdn.sqhk.co/fumediju/55ic0gi/83611527213.pdfIn PDF document text
    • https://retotitinikuj.weebly.com/uploads/1/3/4/3/134349113/mafipitek-zowurekesasow-salatuk.pdfIn PDF document text
    • https://zikamesezelili.weebly.com/uploads/1/3/4/8/134857079/6258958.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_6c835efd152d47b5af69aa41b6555a76.pdf?index=trueIn PDF document text
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_41049e79c48144e3a08a0730f6197ad2.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75E 5252 bytes
SHA-256: e36902c116f41e3ec13107fd4676aea1d670824743b4af17b7476d3c86883cff
font_01_sfnt_off0000f957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF957 1804 bytes
SHA-256: f101fc3023143cbc24e87e2583c027b8b5ab7dfb9504abb66ff99af634bcdac9
font_02_sfnt_off00010232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 15100 bytes
SHA-256: 013bb2974758d1da04e41f674bdb5c08e59d9f6c1e7bdc949a29b24f5d9cbbef
font_03_sfnt_off000131b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B5 16228 bytes
SHA-256: a86703fcf13a9d81696a593a848976679a312995bce87ae50f9347b0ca646315