Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15429ad96d13ce3…

MALICIOUS

PDF

81.1 KB Created: 2021-09-11 05:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d84c1cab49973ac8509acebf29a7b23b SHA-1: 29ac092e71cb19895caeaa1c9b532bd65fd5d80c SHA-256: d15429ad96d13ce385b85ee98988ae08d074591cc8a752caa67a59bd2085c55d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially malicious or disposable domains, suggesting a link farm designed to distribute malware or phish for credentials. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://htygroup.com/upload/files/77051746521.pdf In PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16132a7cfbc931---57524926518.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/zudadusimavedetaw.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/62951163096.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/62631356165.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/kekomun.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/6421115275.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/30699544699.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/121285892.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/luforoget.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109071056058325.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/zitusomiju.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/wolusinopuno.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/uvusuzekakoxagomiwatoku.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/gipavewagadizubiv.pdfIn PDF document text
    • http://centronegozi.com/public/92485102021.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161355dac54c77---xutekokusotavevejuzovetur.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/45532846450.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302193e991a---xatateriwinisimadufe.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/7855972253.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/jowax.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/fobijuxiwajazujezupa.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/kunumosurikukaxifipum.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/nidufelatini.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/19319227408.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2f186bf70a8475dd379bfed8c6c2d81d/pixesejolaxawupixevup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+much+ram+do+i+need+in+my+phonePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 10756 bytes
SHA-256: 42449366f51c6feca5d332feaa1b69054fed65a60e83078891d5f9c302c5c5d6
font_02_sfnt_off00010a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 17220 bytes
SHA-256: b19adbda95d5f08bcd187c09db42e52f2d2feb557f151c1e6d093919d3982f74