Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3731d6238d933d4…

MALICIOUS

PDF

81.4 KB Created: 2021-03-13 19:29:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: e5487093e544efbc3c9edb9b2c68db03 SHA-1: 3faab6901aaad30a415626693dcf400ca502fcb3 SHA-256: c3731d6238d933d4559957b78d0532f644310cd6e1b253e80bc49602216360e8
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The presence of a URL with a 'keyword' parameter indicates a potential phishing lure related to product searches. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://maypoin.ru/wb?keyword=honeywell%2017000-s%20air%20purifier PDF link annotation
    • https://reruwezoketa.weebly.com/uploads/1/3/4/5/134503250/7f52748f52fd29.pdfIn PDF document text
    • https://gomisixazu.weebly.com/uploads/1/3/1/4/131437427/20fdc74d93df.pdfIn PDF document text
    • http://wajazenizur.mywebcommunity.org/11059076171.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426063/normal_604a99dd6ece8.pdfIn PDF document text
    • http://nosilekexiwot.mywebcommunity.org/57179744066.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391921/normal_5ff178b2e4b04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452853/normal_5fdbcc3b66a70.pdfIn PDF document text
    • http://vobajujabu.mywebcommunity.org/wakomuluxituxuwojoravad.pdfIn PDF document text
    • http://rusakadovub.sportsontheweb.net/how_to_program_genie_gm3t_remote.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_fc5001742b00463ca6c0a747afd3f578.pdf?index=trueIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_3622f86dd8c54ced95e958783cb7f3aa.pdf?index=trueIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_a92bea21fc7541f28a4a48b81c8f4612.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/bapano.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/carlos_yulo_gold_medal_performance.pdfIn PDF document text
    • https://2b12d24f-0c9a-4a32-b427-430aba395f0c.filesusr.com/ugd/6cfe90_5f4dee500abb49798b3ee9f407423a48.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pegebunov/filmmaker_pro_vip_apk.pdfIn PDF document text
    • http://xakazasaravi.onlinewebshop.net/70612205290.pdfIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_e23f70367328459485b8494deda7cb4c.pdf?index=trueIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_5d632d89ceb4472a8da22e733cb3afa1.pdf?index=trueIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_6ffbe4588ccd47a49ec404af4fdc607c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sojaxub/mapletree_greater_china_commercial_trust_annual_report.pdfIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_60a3ccbda57246dd9149b19c2bedd337.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/bixuzogojepirigubofi.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_off0000ffc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC6 5356 bytes
SHA-256: e21b0ac44107b31e6a257e8af7ed779675a8781c14802dccfecbcea67c158163
font_01_sfnt_off00011232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11232 11016 bytes
SHA-256: c5c933362dafeb25a69414d2a39b91eda10c4bbfeb70b2336f5a9883d9c1a5d9