Malicious PDF — malware analysis report

Static analysis result for SHA-256 230284d325f90d5d…

MALICIOUS

PDF

70.4 KB Created: 2021-10-01 19:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7ac4fd52fa97c4c64a9763c88e13a8d7 SHA-1: 3806e083cd41e78fdcb9417be82ab6c38d4c4515 SHA-256: 230284d325f90d5d304851e7bf6c0998f6b54942572a74335d0ed150812db888
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and utilize UTM parameters, indicating a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=3d+mechanical+live+wallpaper PDF link annotation
    • http://bluebiz.kr/userData/board/file/jikubaji.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/farixa.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/26241818588.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/61862784460.pdfIn PDF document text
    • http://bndweb.nl/upload/files/94992273391.pdfIn PDF document text
    • http://esistore.be/userfiles/file/5807700845.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/givapopuzofutedewuxufox.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/87167045918.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/6418112345.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/35282567626.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/saxetekorunamezofos.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/tumujiwurinurob.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/76521043057.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/96929690591.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/dadirabesodalesixiw.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/tipidirije.pdfIn PDF document text
    • https://tcremich.lu/files/files/zigaza.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/4595678155.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/forarakozinaxarexox.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/pijaxexa.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/weponaxuxigupasodi.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/54798681053.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/siwokoxofa.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/tupiledidanal.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_off0000b1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A7 16524 bytes
SHA-256: 0d6bd97c9318a9a7da6431130d74bf63d018709a2b727472a029e4feead4f3c3
font_01_sfnt_off0000dba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BC 10620 bytes
SHA-256: 9e0883491e9676847c30937105216aaab7d2353ded580cb52a4d8d76244e80ac