Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce79337aefa57539…

MALICIOUS

PDF

76.1 KB Created: 2021-09-17 01:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c25a9e01d51e4ab20f05e2d0ce46b55 SHA-1: ab03b1937503be264fc58d8c71bca619041873b5 SHA-256: ce79337aefa57539901227656951e245ab77b2b4b201a8979d390f82f292c46f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=android+open+keyboard PDF link annotation
    • http://aj-freight.com/ckfinder/userfiles/files/77482609306.pdfIn PDF document text
    • http://handgun.ee/media/file/pesuvofupasewo.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac8a2e6f3b---67485706547.pdfIn PDF document text
    • http://alkanboya.com/files/file///minaluxitemi.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/22478321488.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/52272038813.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/14111414721.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/40628899063.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/jebelupegepire.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/lemigedatevo.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/85335982666.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/54825508275.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/64477980654.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/dajawo.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/67048675504.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/medefanajafuditanolewevam.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/8e91c79b400a563d4cf8bd9f7eaa3465/bivirotubax.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/46087412826.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/30254271725.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/99620077045.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/53036235515.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/76379701314.pdfIn PDF document text
    • http://z500.si/files/37847258633.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_off0000c852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC852 10400 bytes
SHA-256: f51f582aaea583bb4ed36dc6d700956298396b1b55fc9d76cbcb4a745b4909c4
font_01_sfnt_off0000dfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 16796 bytes
SHA-256: 41ce5e66763b728e4c70ab05986d8590926142448e04eed51b5ba896a44bb0dd
font_02_sfnt_off00010b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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