Malicious PDF — malware analysis report

Static analysis result for SHA-256 32727e4a67e7fb67…

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 18:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01b65e4892ff92ddb2369a8b5146fdb7 SHA-1: c126fcc825b58cbde89f066e9e062d4cab450954 SHA-256: 32727e4a67e7fb67144ee4f4496561bbdba3d832eb22de04ac9c0801a2489542
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm on disposable hosting, and numerous external URIs were extracted, including one with a suspicious query parameter. While no scripts were explicitly extracted, the nature of link farms and the detection names suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://synerhu.ru/uplcv?utm_term=iphone+pogo+spoof PDF link annotation
    • http://hferrynetworks.com/FileData/ckfinder/files/20210913_A911347206D961B6.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/13791821428.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/jarixom.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/roverira.pdfIn PDF document text
    • http://rhondachem.com/d/files/fudonuda.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210921175025_1453508874.pdfIn PDF document text
    • http://jiab.net/userData/board/file/lotajemamerota.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/rabapewaputiraxokev.pdfIn PDF document text
    • http://jadeite.ru/images/file/87519944098.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/bugokowutopumataduvu.pdfIn PDF document text
    • http://all-premium.com/user_file/files/80063546152.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134df2d07329---42378083845.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/bofoko.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210924121036137971.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/99944607853.pdfIn PDF document text
    • http://simonide.org/userfiles/file/36030736911.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/38901534926.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/70807875836.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/66cb0f88kltb3cbe5dvvilmhl2/46014391644.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_off0000ace4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE4 16512 bytes
SHA-256: 4a01946abcb2d185ab3589174de6d8fb1f72fddb3792c51352461f11b5680773
font_01_sfnt_off0000d6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECB 10088 bytes
SHA-256: 7e16da4fb63cc4ff3c12babd14ff9ba9bb9908d613433511698187e06709a39f

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