Malicious PDF — malware analysis report

Static analysis result for SHA-256 88be22a7c21cbfa2…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 19:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cfa13b40823216097fbb8e688f2eb2a9 SHA-1: 9b707676ba06f37a75a01ca9ec1261016c1f9443 SHA-256: 88be22a7c21cbfa2edf00dfd51d5884263c71204514fb0c8fde8565e11eaa49e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically highlights the nature of these links. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=sat+practice+papers+with+answers+pdf PDF link annotation
    • http://thietbiotoviet.com/Images_upload/files/tivoreboseviboza.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/bufuwa.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/rosukizerovutujuxomupine.pdfIn PDF document text
    • https://phr4u.com/files/79592767324.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/mexaxadofominutezidapab.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/vuwiduxotujabisodas.pdfIn PDF document text
    • https://gameclub.by/uploads/files/38358350920.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/wudovo.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/88319100861.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/rafutidaw.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/081505299302.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/29840744257.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/80227110417.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc85481fcc---kalidupezatelapoker.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/liwofijigimelafibegujomo.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/46171824734.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/nadopezixeg.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/47543070698.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/pitiponotinuf.pdfIn PDF document text
    • https://negaratoto.com/contents/files/topolegetazebod.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/42244790818.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/26356160661.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/97310089913.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_off0000da1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1A 10712 bytes
SHA-256: ea6ebebb1b773a5678f8d34122514b559dfcab54cad748b285b1dbb89acc4ef7
font_01_sfnt_off0000f2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 18828 bytes
SHA-256: c6d6da508feb66a916c96ac55bfcc0949eeabfd02cb393f2cb78a3c8ac55ea29
font_02_sfnt_off00012473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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