Malicious PDF — malware analysis report

Static analysis result for SHA-256 651a7add77f54aa8…

MALICIOUS

PDF

90.7 KB Created: 2021-09-18 14:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cfcaeaf6d0c5ec6279085328ad2f28fb SHA-1: bd1bc2c5da7d2352763d433808c9d2876fba9c0e SHA-256: 651a7add77f54aa8f5834e20abb276de36e78da689e0af7806ebaade61768dbd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest an attempt to exploit users through redirection, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://infrive.ru/uplcv?utm_term=pocket+gamer+android PDF link annotation
    • https://machnhaduong.com/images/uploads/files/6667088331.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/ledetaxabomup.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/65dd2a4c7dd55ba77a169ed94ed103b8/dovogizalabu.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/donoduge.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/magogelawikabuwi.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/misajuwobatimalovusebawon.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210913_49F45C21720EAA14.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/javajab.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-10/20210910154331727863.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/44234685230.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/48955134225.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/waxaxavo.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/78088149321.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/28324014477.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd0d49e8a4---40108726795.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/kujoximonemirikifax.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/jipobojozeta.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1a0d7642c---gisezomulopefame.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/zuxuk.pdfIn PDF document text
    • http://innotack.com/userfiles/files/47899128496.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/80779902462.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_off0000fe83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE83 18064 bytes
SHA-256: f6cb692bb4daa739a3108314ef5fb50447fcc7a517c7c2c416783087bda96d02
font_01_sfnt_off00012d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D30 10592 bytes
SHA-256: 4b6dd758314c0d2ff5757a74da2de35ad510f98347e2aadde6caaa7424d6f5eb
font_02_sfnt_off0001452d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1452D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1