Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d94a858355c7d24…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 08:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 21fbd473e7dd692c995bdd0708caf94d SHA-1: 4ee28dea463d5f9ec691be90fa66f519cc5c8b75 SHA-256: 3d94a858355c7d241752d6662766aba39dc765d69a71f98d12e462357ad5d40f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure and embedded URIs indicate a likely spearphishing attachment used to deliver a payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=phone+stuck+on+starting+android PDF link annotation
    • http://www.oomewatersport.nl/upload/files/ruferidalurimajuxi.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/betesikaros.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/mevir.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/roputovepemasog.pdfIn PDF document text
    • http://sksound.com/userfiles/file/kamix.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/89604398250.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/buzonufon.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/niwija.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/vuvajovew.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/zoxiluxuzug.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/sufebokotojekusabopa.pdfIn PDF document text
    • https://adikmanis.com/contents/files/buguta.pdfIn PDF document text
    • https://sentralperdana.com/file/98516345171.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/rebegeruzivoniza.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/87915988839.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/tusekijafoxemese.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f1bfdddb1ce4db5e8509f9d353b428e4/dagowamumusof.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/gubupulozitimuj.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/lasoruxukimenokopoxab.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/502315634.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/sixozamefe.pdfIn PDF document text
    • http://centronegozi.com/public/35127320295.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/74456544143.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/14226401420.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_off0000d8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DC 18136 bytes
SHA-256: c0917444d25d17176c8f19b50712d841b87f8d25c21791bc3bccd829877d35a1
font_01_sfnt_off00010754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10754 10796 bytes
SHA-256: 8462254d12d21d2b2ba5fc1ec8076da9391ac4d7f807751798b0e600ecd9b991
font_02_sfnt_off00011ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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