Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61092b6bac158c5…

MALICIOUS

PDF

74.7 KB Created: 2021-04-07 06:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4bc7390fdb6df300c3afcfa7f8c47b0 SHA-1: 2d67eb3bc1a90d8d6238d68198e786a852c79884 SHA-256: d61092b6bac158c575efc833e1f3a085f0486003e88d29f7779e02084cd12b29
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics and a machine learning classifier as malicious. ClamAV also detected it as a phishing trojan. The document body, though heavily obfuscated, suggests an attempt to disguise the malicious intent with seemingly educational content, likely to trick users into visiting the linked phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=physics+classroom+waves+answers
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • http://cyberghost.store/821573672931fil0.pdf
    • http://ejqy.com/nombres_que_tienen_significados_malosrvusy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/28144aaa-5249-44dd-a714-993db13cf775/12007344781.pdf
    • https://s3.amazonaws.com/lupuvogotog/sarozadugatubinebamilo.pdf
    • https://uploads.strikinglycdn.com/files/622ab33a-ee85-40cd-aa37-d68990a50c75/pututuxalubelesoxa.pdf
    • https://s3.amazonaws.com/lewuli/35828981595.pdf
    • http://sajogaluka.rf.gd/bearing_types_and_names.pdf
    • https://uploads.strikinglycdn.com/files/0f941340-f3c3-4214-8c74-9b5abfe6603b/fumamujomawanifisofi.pdf
    • https://s3.amazonaws.com/nuruvapozixix/arithmetic_geometry.pdf
    • https://s3.amazonaws.com/bojafazes/how_to_import_bookmarks_from_old_computer_to_new.pdf
    • http://vesunebujel.rf.gd/cerere_in_casatorie_cehov.pdf
    • https://uploads.strikinglycdn.com/files/867599ec-6203-45f2-b6db-ec5496463652/46802937004.pdf
    • http://zelibigevuloxuj.epizy.com/amelia_bedelia_goes_camping.pdf
    • https://uploads.strikinglycdn.com/files/36e9bcd1-8ac5-4c49-94e4-286b372ffe23/retizafusezo.pdf
    • https://s3.amazonaws.com/rafiralexezol/68909875776.pdf
    • https://s3.amazonaws.com/vidadaviwal/rulijozikanenol.pdf
    • https://s3.amazonaws.com/xokebore/26434666797.pdf
    • https://s3.amazonaws.com/viregujipowuru/dememadalebo.pdf
    • https://uploads.strikinglycdn.com/files/cde4ad3c-e708-4e5f-81c8-453bd25d5835/repexel.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_off0000e60a.bin
af53f9c6aac22db96f0a2003cf563d44dfe29d841eb970bcc376ceb0e08be7f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 5296 bytes
font_01_sfnt_off0000f7f6.bin
ff5fe805209cf40391c248392c9b6d7a877845bd2f31687eb488827c9c8d95ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F6 10648 bytes