Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6ace9a4aad772c…

MALICIOUS

PDF

84.2 KB Created: 2021-09-12 01:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bdb62c7d87cae0e5671718573868bfc5 SHA-1: eabca398c0788eca9f23cc3f2f078b0230d42441 SHA-256: 3c6ace9a4aad772c628ec933c59e5af516f19512568a06c0c42938e8845edade
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and the presence of many external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=xperia+10+ii+stereo+speakers PDF link annotation
    • http://pravkniga.ru/files/userfiles/files/kasapi.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/nukapadupalozubugekimi.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1630501243.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/73089713756.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b287123f8---84709252586.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/93929382399.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/17070556164.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/jixijase.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/loporesoju.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/zemuxovix.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/xifugewokamodawi.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/16554982495.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/84554591825.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/79067579216.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/2156188788.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/tawerumajojum.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/sokuludotazelarige.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/wemebude.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/pusezenapuzox.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e6f349258---julazozexopesulegafitufug.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/86030673237.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/28220746018.pdfIn PDF document text
    • http://fkhd.cz/data/img/46019196536.pdfIn PDF document text
    • https://ocw.tw/uploads/files/37649305633.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/tujosebitekobotogata.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_off0000e337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4E 10368 bytes
SHA-256: afd256a03392d36d7881b08913fb29dda2be9bea254f25ad1eaebab642dba690
font_02_sfnt_off000112e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 18928 bytes
SHA-256: 7666a576a50401e69be1dbd7bef08e82237e608e206aff008d06355cf49debbb

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