Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdeaa4f25d6b3f93…

MALICIOUS

PDF

68.2 KB Created: 2021-10-04 10:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8f90c34bdc5f91f3a780dda55b196862 SHA-1: 5680989cd02eca2cbb32e0923ddd035ef1fd67f3 SHA-256: cdeaa4f25d6b3f936025cbe4a245db9237d5c083c88b5ae7162be36e5b1331ab
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded clickable actions. The heuristic 'PDF_IMAGE_LURE' indicates a common tactic where a screenshot is used to mask a malicious link. The numerous embedded URLs, many pointing to disposable domains, further support a phishing or link-farming attack pattern. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://pemaboutiquehotel.com/assets/userfiles/files/81150578414.pdf In PDF document text
    • http://abwingstop.com/uploads/files/fabibelegakubifa.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/74214885907.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/82522842777.pdfIn PDF document text
    • http://c-six.it/userfiles/files/gofixezumagivatazisirari.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/6052633944.pdfIn PDF document text
    • https://heureka-cz.eu/files/sememe.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/54675728440.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/839d72e8589e439b6ca1634c68575aed/93711882097.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/76393459026.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/kitusikirawuxe.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/sesizazodu.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/kaxirirope.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/jepikujipopuleja.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/69862244745.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/fuxam.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/69165260961.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/wuwuwobepakekixesivupuk.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/67672859567.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/jelufesebodatos.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/xozilurutitavabivexuwot.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/10221103429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=walworth+county+wi+register+of+deedsPDF 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_off0000acef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC501 14644 bytes
SHA-256: 2595d4f098ebc546ba5e85a295cf153bc537c204a5e1c2e550b6b95bbba7b1e6
font_02_sfnt_off0000e9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 11048 bytes
SHA-256: d3173fb5a4662bee34cbe1b09c1973376b0d135d10fde75a271f33c60a494e5a

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