Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7be7ac1e1af258c…

MALICIOUS

PDF

79.0 KB Created: 2021-09-10 10:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: e479c9747ad53612e488a033584aefe1 SHA-1: 82699a386907f43b0aa77bf5494d7b1677b4d92c SHA-256: a7be7ac1e1af258cd6239dac23ff89f07d543a94b7a350440a4b4f8f4591ba7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://latework.cz/soubory/sepulefobosu.pdf In PDF document text
    • http://poultech.net/d/files/wedanepowasimakitas.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/45338987743.pdfIn PDF document text
    • http://grimastone.ru/files/molubolivut.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210909012511.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/3779dfa8ce4b4cbe3a1c56e6910d2a10/93392125698.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/vezosuboxukinabaviduw.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/20924765909.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/rufolixoniribabu.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137bcd03e8f3---96752892487.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/44621162290.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/811956206.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/92972988233.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/mosunetisofizusopawum.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/22531538679.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/fijilifore.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/xofiwinaxelapadel.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/54954305454.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/raxunipisuga.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/zavalelirevi.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/puzutalofi.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/73407890216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+clear+play+store+app+data+and+cachePDF 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_off0000cef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF5 17980 bytes
SHA-256: 09e8299da5f9385680d1f9088d484f592a06d791e6f7be8784beb5fa67934b3c
font_01_sfnt_off0000fd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 10708 bytes
SHA-256: 9051cb5d6c5fd1f22a26dca324590ad37678d86c155d5b9d131dc42fa7a63053
font_02_sfnt_off0001161c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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