Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81c0dcd486db92e…

MALICIOUS

PDF

71.2 KB Created: 2021-09-20 07:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 519df7610f0d00ef09d7da392dacd461 SHA-1: f4e4f36255c98e0ab7bf784518ca48c82c7142de SHA-256: c81c0dcd486db92e1e32aa610a33fec370856bdbad4735eaf695bea15e28aba2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=crazy+machines+android+apk PDF link annotation
    • http://associatedreclaimed.com/userfiles/files/81812216279.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/melomi.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/kanimokosonunemuk.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/sezimomeweloweti.pdfIn PDF document text
    • http://anm-av.de/uploads/files/xotamakis.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/gasezaveb.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/46952868873.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/madukiwomo.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f48cf50aa9---wupuxofimejadotovera.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/kojoxovogujexokapit.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/bofebusezod.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/maderapar.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/pijituxufuvivixapatowuki.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/13379733824.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/kemad.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/diraxobizow.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/30764886054.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/nipezuribifasijato.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/3424948498.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/jezid.pdfIn PDF document text
    • http://eventechsite.com/files/files/26681796230.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/gojunugefejafavapivow.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/16659244309.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_off0000b322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB322 16640 bytes
SHA-256: f898352ad5ec9ec3c0e06dbee784dc8c9ce842f60e9c225e5484a755422d7b32
font_01_sfnt_off0000dda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 10932 bytes
SHA-256: 6faad0dc12738cf31df9fedf273b0508cdac95f67692dc2b1c2532863b571236

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