Malicious PDF — malware analysis report

Static analysis result for SHA-256 78091d6f20b0c398…

MALICIOUS

PDF

78.5 KB Created: 2021-03-26 13:17:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed423c4489c661c361d99cfebeb0156f SHA-1: e59a89950ce5ba192652412f7355bcd711da3475 SHA-256: 78091d6f20b0c398ff618143a5bb278e7dbce911485036f50ef8178ee6fcfafb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the nature of the link farm suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/123?utm_term=deep+fitting+bed+sheets
    • http://judafipixomet.iblogger.org/champion_3500_watt_generator_troubleshooting.pdf
    • http://boevoenlp.com/rarabeu1yxy.pdf
    • http://jodefugivu.22web.org/84079020051.pdf
    • http://sibuvre.com/83754306499x4uz3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_c03adb6956534bbabe96e67634656278.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bff35900-5f7f-4044-b2e3-313ea6addd62/health_and_safety_jobs_entry_level.pdf
    • http://wukusagabibumaz.rf.gd/words_that_start_with_pre.pdf
    • http://nezixaleweku.epizy.com/xalipaviro.pdf
    • https://uploads.strikinglycdn.com/files/8a1299b0-7ca9-4f5c-b44f-71b2f13dab73/kulakojumigatovaku.pdf
    • http://juninowixa.epizy.com/annabel_lee_allan_poe.pdf
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_f2b5abb1386e4fb08a2e0d5fbac71573.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8593bf5d-38ca-430e-99bd-a7a74b76c955/jarodovejaxetakebiwaxirix.pdf
    • https://uploads.strikinglycdn.com/files/92c8fa18-fdc3-4c53-8a03-4998813fabbe/renimofeze.pdf
    • http://sepazebop.rf.gd/65522253718.pdf
    • http://konivad.epizy.com/11597080988.pdf
    • https://uploads.strikinglycdn.com/files/5e079e81-611c-4f55-8679-765e6b21001e/1247309615.pdf
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_7c1c2e0be0c24d37a3d881014b44d609.pdf?index=true
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_f6cd00ec3a4e4741a029870fe1b603ed.pdf?index=true
    • http://gibegedagaseri.epizy.com/portuguese_verbs_conjugation.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d6.bin
c6ec7ee5e7eb1379ffa0850111276258bac87506de1fb64c931e0ffb88856b89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D6 5104 bytes
font_01_sfnt_off00010638.bin
335709500095c2efb6bd43a12579cc434e87f9b238313f3e4c47fee8e81f38f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10638 11736 bytes

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