Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c14c795ce9b72f…

MALICIOUS

PDF

74.6 KB Created: 2021-09-01 18:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 51019400af4b7bc7549b24e95def027b SHA-1: 8ceae7345b9cebdd06e3915e9ffc6f0c56feb850 SHA-256: a2c14c795ce9b72fb6cf780830277594be91427e3c5fea5b0ef12ff2ff496c8d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple external URIs, combined with heuristics flagging it as a link farm and an invoice/payment lure, suggests it is designed to trick users into visiting malicious sites. Although no scripts were explicitly extracted, the PDF format often utilizes embedded JavaScript for malicious actions, such as downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://cructi.ru/uplcv?utm_term=outstanding+payment+request+letter+format PDF link annotation
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/pulexifaradafati.pdfIn PDF document text
    • http://faradbox.pl/files/file/pejexizavesoleke.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/11511460389.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/tikozepemo.pdfIn PDF document text
    • http://grandviewheightsalumni.com/clients/79364/File/28173883287.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/13712723238.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/c5c18c376894d4a145ac8a07fef058b9/mowawudun.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/52582645032.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/6686319349.pdfIn PDF document text
    • https://paperland.bg/uploads/file/86250513561.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/hijf9dccis33a7dv2euitv85a7/83332640905.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/mogezelobuziwukux.pdfIn PDF document text
    • http://cloverdiamond.com/file/63606939381.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/14613801151.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1628935726.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_off0000c03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03A 16684 bytes
SHA-256: 79b42f308208bb443fd96cd97c7a4fd2453f5cfc2299818916c966bd7afb684c
font_01_sfnt_off0000eb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 11228 bytes
SHA-256: c69e5231db43e6b618956bb03e6cba35ea63d4794d8b166d55a80be3f9389ff0
font_02_sfnt_off0001051c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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