Malicious PDF — malware analysis report

Static analysis result for SHA-256 447d9171c665677b…

MALICIOUS

PDF

137.4 KB Created: 2021-04-06 22:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 500e1c2cf0df1952775751fb93651704 SHA-1: 7a9cf083126df3b89d0a4997950329fd12397bbd SHA-256: 447d9171c665677b7fc59d4d5dec7148a1699435d22c7bed7b859db7673d668a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=nombres+de+jes%25C3%25BAs+en+el+antiguo+testamento
    • https://gawugabel.weebly.com/uploads/1/3/4/3/134361726/800840673f1258.pdf
    • https://static.s123-cdn-static.com/uploads/4491673/normal_5ff49686ee3be.pdf
    • https://cdn-cms.f-static.net/uploads/4426813/normal_6039b2b20144a.pdf
    • https://lonunirixug.weebly.com/uploads/1/3/2/7/132710494/ruxonamin.pdf
    • https://kekorozonositen.weebly.com/uploads/1/3/2/7/132710750/gaperiremimuvem.pdf
    • https://static.s123-cdn-static.com/uploads/4446499/normal_5ff079f00fe21.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/patotale/defiwoxawujedubabowom.pdf
    • https://s3.amazonaws.com/gujutavevive/kabezaturedinef.pdf
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_ee4a822352624323942b77d8c3c50772.pdf?index=true
    • https://s3.amazonaws.com/baposivarabuj/watufodaga.pdf
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_9c97d2ea7dd147199c2d83d2014743e6.pdf?index=true
    • https://s3.amazonaws.com/pusolefosex/real_estate_capital_markets_analyst_salary.pdf
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_acbb2e5fa1af4a04be755d0670ead035.pdf?index=true
    • https://7722bba5-72ad-4d15-a72d-9ce9fbdcf1b5.filesusr.com/ugd/772ad5_5dca5d29091a42008eff8416817f505c.pdf?index=true
    • https://02274cc9-8b57-4441-be19-e46c089ec46b.filesusr.com/ugd/f11b8f_34229882e7e649a59943b3ac1e97187b.pdf?index=true
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_ab60875397f94453836f3ca68a78a89b.pdf?index=true
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_26a48804029d4bfc96f7247ac832d169.pdf?index=true
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_cd6eb2b20ca94db3879e107e1128bfd8.pdf?index=true
    • https://s3.amazonaws.com/jifedefujodu/does_grohe_have_lifetime_warranty.pdf
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_4f2e009cb77a4201bcfe769513156237.pdf?index=true
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_7cba7c3b87874bd98d8440d74504b540.pdf?index=true
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_87349770fad14261a1a5b776286242bc.pdf?index=true
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_3dbf8baa680041858a3eec0e25f22a79.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b376.bin
c1e0998b1b97d779a8f44272fc267c743cef1b6f1024d2a9a5a1456b7079043a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B376 5448 bytes
font_01_sfnt_off0001c5b1.bin
3465934bad429d035e86cef0b0470b0a7156a8926bcd3eadb29d858fe288733e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5B1 20552 bytes
font_02_sfnt_off000200b4.bin
0ccaabab00c593b8b50df1534916140cd70f1aa32530d56dfba19e814c16e9ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x200B4 16164 bytes