Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c9d66da84f95d0…

MALICIOUS

PDF

87.1 KB Created: 2021-05-24 04:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e6cf8d06d90010347558d54b8d3dabd1 SHA-1: c91483cb1802492f7f7e2bc433af1d811128cfe2 SHA-256: e3c9d66da84f95d0226d3529bea01b040ef0744ac7292e7daaaec7aeb977d0d1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary suspicious URL pointing to mezovuduw.ru. Heuristics indicate this PDF is a link farm on disposable hosting, designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://mezovuduw.ru/strik?utm_term=50+sombras+de+grey+1+pelicula+completa+subtitulada+youtube PDF link annotation
    • https://tapugagujug.weebly.com/uploads/1/3/0/8/130813715/452c2fd.pdfIn PDF document text
    • https://darimigavibibej.weebly.com/uploads/1/3/3/9/133997658/jalamow-kowazufez-pizinizelem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393790/normal_5fe422d2d1598.pdfIn PDF document text
    • https://fefumuvujudadi.weebly.com/uploads/1/3/1/6/131606087/tebixatasube.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373508/normal_5fca7aaba2ac6.pdfIn PDF document text
    • https://siluxukazikuwo.weebly.com/uploads/1/3/5/3/135326211/1987813.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443326/normal_5fcce7064c313.pdfIn PDF document text
    • https://dozowogan.weebly.com/uploads/1/3/4/0/134098910/3f1927bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469850/normal_6008168534ab4.pdfIn PDF document text
    • https://nedugapepo.weebly.com/uploads/1/3/4/2/134265444/runurusefujopeb_zosisosawolivuv_ponibem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369648/normal_60477ee74a100.pdfIn PDF document text
    • https://mijeridofuba.weebly.com/uploads/1/3/4/6/134677835/3109643.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/df9e981d-3d43-4c8b-8ca1-127e490dc1a7/war_of_the_worlds_2_the_challenge_spoilers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f487e3dd-8d97-40f2-9da2-9680b63d14cd/garmin_gps_da_polso_forerunner_305.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/wahl_clipper_blades_set.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/47080719321.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/525e79ee-5c8f-492b-a07b-e3ca27d7e79c/94113496481.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/fogobifagopajuwejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a09c42f-0f8a-49e6-b976-e2a06d105569/nafumuxaf.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/how_to_reset_a_v380_camera.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/79837412485.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bc3c87a-0256-41fd-b3de-841db990c9d7/what_is_the_social_learning_theory_in_sociology.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/16098960136.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://scripts.sil.org/OFLIn 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_off0000f7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CB 5856 bytes
SHA-256: 5afd44b52e99d9b5ff11f63876444ad487e7713cc75871c8c5fc91cbf5492fb3
font_01_sfnt_off00010bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAD 12452 bytes
SHA-256: 6ba4ffd97bb1b8cebb1bfb61757d9e5a3ae2ae308ea6acf35b8594a115fb9685
font_02_sfnt_off0001344a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344A 16904 bytes
SHA-256: 2b4a3daebc81ffb44078d8de0b27369d5350b19adb85c3a7343ba2bbf65d3ad1