Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fbbb08a2e2ab32…

MALICIOUS

PDF

73.2 KB Created: 2021-09-30 21:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 99249a9462a11e1fd1f48de38ceb3343 SHA-1: 26b05bf90f8e4176361f68bd9eab603e7967d2ee SHA-256: 57fbbb08a2e2ab32cc7af6103578d65cd55425e40874cab1d8470a5694364204
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that redirect to various PDF files, acting as a link farm. The primary URL suggests a lure for game downloads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=call+of+duty+black+ops+free+download+for+android PDF link annotation
    • http://wish-pharma.com/upload/files/1540578077.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/42336735342.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/22385276636.pdfIn PDF document text
    • http://imprezka.2kc.pl/Upload/file/70845791980.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/12663685979.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/vapozikup.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-11/20210911024915186707.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/bazowa.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202196174464041.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/4235953656.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614ff202e20e9---mitekerudematukizepofale.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/69344128184.pdfIn PDF document text
    • http://candientushinko.com/images/file/lukofowenumivi.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/fp7lk2bhokqgcug3psdnvpbr03/lekolezojenaridosoza.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210902184306.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/26078429147.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/20469333653.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/lebubew.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/29223267183.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/xuwukotoxo.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/76220176511.pdfIn PDF document text
    • http://dentherapia.hu/files/file/lapevimumebesazarapigobo.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/kunalege.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/wumatapizixofanozakag.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_off0000b291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA8 11176 bytes
SHA-256: aae07232efd0f9ab6ca4fb692d501a744690e518657e899c3bf19e03542305c2
font_02_sfnt_off0000e4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 19692 bytes
SHA-256: ef085e7fe853ab7b4b4ce67091c73ae74d65e0702e9de59c12b641ce48cb5746