Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8728f02cab1a99…

MALICIOUS

PDF

67.2 KB Created: 2021-10-08 02:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 205271369b12d61945d5539bc3747027 SHA-1: e561acd0a3a2c5b0bd65db99ea09f4325a582ed3 SHA-256: 8a8728f02cab1a99e72a9a987d2081ce6f1488a928ffb16b157ec2d04e2307fe
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The heuristic 'PDF_IMAGE_LURE' indicates it's an image-only document designed to trick users into clicking an embedded link. The numerous extracted URLs, many pointing to potentially disposable domains, suggest a link farm used for distributing malicious content or phishing pages.

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 0 text block(s), carries a click-outward action, and is only 67 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 https://bhandarisurgical.com/ckfinder/userfiles/files/romaxusokukufitabonavotu.pdf In PDF document text
    • http://jcnjl.com/userfiles/files/xubefiwesemok.pdfIn PDF document text
    • http://fkhd.cz/data/img/pomizurujoxuwalimegebirev.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/nasofeniribov.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/27064807916.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/77585796272.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/parewufudosarilaruraz.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/laruxetosowanet.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/fodufol.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/83109464370.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/77209494000.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/68586427383.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/vegedutejalalupukitudewem.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/ranigozusuwikujusejiba.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/26258677393.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/88829928782.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/77967491064.pdfIn PDF document text
    • http://pedraferro.com/files/files/99560995435.pdfIn PDF document text
    • https://gsc-tw.com/userfiles/file/dipewinewej.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/gatejurifadopefupenaposow.pdfIn PDF document text
    • http://drironcat.com/images/file/semepezujobodevenok.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/7017799737645b7f2e260e12216ea108/mebid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=george+lopez+george+watcha%27s+out+for+jasonPDF 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_off0000ab93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB93 13596 bytes
SHA-256: 4fe73a985b482249a03f51501ab18104587ce6458f8ef4585aa31b5b6f3621c5
font_01_sfnt_off0000cd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51E 11116 bytes
SHA-256: 199f38ee1ee156aea69375be834b52034e8e4f037c61543fda615dd809ab0457

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