Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5e64e18c7d183d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 00:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 241981653ee4cd1d82fba38a0bc99fa4 SHA-1: bb3fec2795271c5d161cbc38dd1df32dfa379d12 SHA-256: 0a5e64e18c7d183da26e411e9f679934d13bf7f62dbf399a2e4d702d5f168bf3
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm designed to obscure its true purpose. The 'Password-protected archive handoff' heuristic suggests the document's primary goal is to trick users into downloading a password-protected file, likely containing a secondary payload. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://gberwanda.com/gbe/useruploads/blogs/files/71777384451.pdf In PDF document text
    • http://qtjdb.com/UploadFile/2021/09/15/file/20210915_190000_132.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/pitaxabivusevozanufuw.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/papenudi.pdfIn PDF document text
    • http://toroisg.com/public/images/files/jopanaxupakusu.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/punatidusukasekotaru.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/sizelivafesoxowunokeperi.pdfIn PDF document text
    • https://cristalensi.com/public/File/95443284246.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/newiwuzizalagamamo.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/98332714281.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613117766d8af---jukabemu.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/12786353617.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/91024089865.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/bilaxuvafakesijivagen.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/zuzetukemoravufo.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/70889134109.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161301693dba00---83179075967.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/lifoxowatiwavi.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/32901128993.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/fomomi.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/65206944597.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/28631832724.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/kobupidegekulozajukimepib.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/63426751474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=hk+gm+yt+virtual+apkPDF 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_off0000d7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D1 18404 bytes
SHA-256: f10737ad024916b26b49356d69aadc03a3318f174405cd9b57d809f728bea6d2
font_01_sfnt_off00010778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10778 10432 bytes
SHA-256: 8d84fd5d14d60d14ffc57dc78292d19fd33669c0cc47de4fce3dbc5d9c1e9fbe
font_02_sfnt_off00011f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1