Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d6457bd256202a…

MALICIOUS

PDF

78.1 KB Created: 2021-04-21 21:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e85059663b2104a0b56c226cef2e4fa2 SHA-1: e785bcfdaeb63a4e62a355236b7d5219d58e8730 SHA-256: 56d6457bd256202a1321a409d0684b70c192f3987a73c4279e638c4fa6777401
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a significant number of external links, many pointing to disposable domains, indicating a link farm or phishing lure. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic firings strongly suggest an attempt to redirect users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/strik?utm_term=what+is+a+causal+essay PDF link annotation
    • https://segakimorepej.weebly.com/uploads/1/3/0/7/130738797/getaxum.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/voltaires_candide_satirizes_the_idea_thati58ha.pdfIn PDF document text
    • http://espaceabonne.com/fleet_vehicle_maintenance_schedule_templatednmej.pdfIn PDF document text
    • http://bristol-yalta.run/liberation_theology_and_marxismvxsks.pdfIn PDF document text
    • https://reralifinopu.weebly.com/uploads/1/3/4/0/134018386/c54cebd6a.pdfIn PDF document text
    • http://j3vnci4.xyz/dejawulumofufoxezumedkleea.pdfIn PDF document text
    • https://nedotumawu.weebly.com/uploads/1/3/4/6/134626041/jitusetotageg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_f19ec08c924440f3a5b51bc4dbce5b56.pdf?index=trueIn PDF document text
    • https://dc010c70-835d-4b56-8cb0-1e1bda7cab64.filesusr.com/ugd/fb576b_84dc16230ed94a5ab45eb0aec1cbf8d2.pdf?index=trueIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_516189bc57654e69a28c47cb2cff3076.pdf?index=trueIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_82d2a35ec63d4f1b968950f5edc1e892.pdf?index=trueIn PDF document text
    • https://d80f29e5-b60c-4034-b355-14c03cb49cca.filesusr.com/ugd/ff44ec_b100e378376c4451bb7859489517c8a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/motibes.pdfIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_eedd42da9dbf44bc93e3f647a94e869e.pdf?index=trueIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_3f2f18b12bd041f8ba52bb9050d306ad.pdf?index=trueIn PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_3dcfcbd2f3494617a72a2283c404ba95.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/vowijugasevugejerozupe.pdfIn PDF document text
    • https://951e66c5-660f-4748-bfcc-a6cc0831133d.filesusr.com/ugd/4967bb_78e39023d87d43d693f34ec9806d684d.pdf?index=trueIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_f87277c6973e4850b215fd877bea32d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/92551202829.pdfIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_9b01c4f120534516a50c5a072624f089.pdf?index=trueIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_9fcad50ea5874fee90dbdf35e9b7ff51.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 4908 bytes
SHA-256: bcda6cb14865b9870bfb1cfa861f14e6cd063ee58a9e160a144de12c3b331586
font_01_sfnt_off000105f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F7 10960 bytes
SHA-256: b3bc5ab8d747286d3cbf6d9da879e16fa1622c47208b8965fd57d302304c734c