Malicious PDF — malware analysis report

Static analysis result for SHA-256 5199024eee8c2c32…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 02:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: da82ae131da54cd5e93a55c59b259234 SHA-1: a38aec5920919a2077760ff8236a01432be3129d SHA-256: 5199024eee8c2c325b88659a285a650ece1abb614b4fc0824f21a7d580639d73
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or to redirect to further malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://laborke.ru/uplcv?utm_term=step+up+2+full+movie+online+with+english+subtitles PDF link annotation
    • http://valsadindustries.com/userfiles/file/sixokojikarikoxowikezi.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/gibilelisosirotuki.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/94643629720.pdfIn PDF document text
    • http://chamdure.com/DATA/files/87184127989.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/rajupewelolig.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/kigoxerepiwataj.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/2016906081.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/37089122989.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/wamem.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/65664981888.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/dijikurin.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-5/20210905084631416320.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/85152085629.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/livawipejugosot.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/xawetexime.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/pigetukudomonejuz.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/zunawa.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210914_0284E959114891C3.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/kikijijekufulubupavek.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/pitoxuxufureduwuwukomiras.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/96517262115.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/gatugijavulufobedotovadi.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/xapiwumasanima.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/lokemadebixizodaji.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://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_off0000de77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE77 11132 bytes
SHA-256: 8d0226ca7b6c26ff599ad2eeeba64f3b85429057486df0fa2f1d95bfc165de22
font_01_sfnt_off0000f821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF821 16696 bytes
SHA-256: 9ffa0ad173531566471e1bb46f19b74e27ce94fd824635f4f7b6561415d43f5d
font_02_sfnt_off00012324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1