Malicious PDF — malware analysis report

Static analysis result for SHA-256 4693a8a01d118a50…

MALICIOUS

PDF

69.7 KB Created: 2021-10-02 23:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1fc0c2f096bf828d2f06e7440c0a25d5 SHA-1: 5de6026f5581992d307bbb95ea687bb70c445325 SHA-256: 4693a8a01d118a50c1034d241d969c46813e4ee604b6325170b747d7acd5e3c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=non+subsidized+meaning PDF link annotation
    • http://steinemann-ag.ru/98081186582.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/9071553428.pdfIn PDF document text
    • http://storemisr.com/uploads/files/boraweravuganil.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/duwef.pdfIn PDF document text
    • https://banifatemehmashhad.ir/userfiles/file/lofadele.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/98429913499.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/15499697211.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/sinedazefakonex.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/dikunezubewiw.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/zikefabozilatanemurubi.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/23398338839.pdfIn PDF document text
    • http://calisnt.com/uploads/files/19220698846.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/kitijometodasogupozuxexof.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/wozaridevumejibiminudoda.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/26084134626.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/57205947638.pdfIn PDF document text
    • http://flomojapan.com/upload/files/fofijefakexunutuzoza.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210919120741_y3ncpc.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/dovesakanasinup.pdfIn PDF document text
    • https://ibextrail.com/editor-images/94109852046.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/59812378878.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/30388872864.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210905_701381DCE10B14F0.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/3756bbf5385d9d642702dcfc0a56f35c/68584488747.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_off0000b28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28F 15156 bytes
SHA-256: 819df38ffd86079865a2e074a7f3102dbaa2a0eaf0bb476b8d9cdaf8eb5ba17b
font_01_sfnt_off0000d900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF117 10624 bytes
SHA-256: 6886a9f0de7993b3e9d5bad3b2a4e26af19970ba2d9edf2954b20d67f74ff8fb

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