Malicious PDF — malware analysis report

Static analysis result for SHA-256 522f8d98f7128bb2…

MALICIOUS

PDF

77.3 KB Created: 2021-03-17 17:57:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7997c5ab795fa76571941c7b5f2cbb1e SHA-1: 5e1d925986d148cc2b9db58f6ae3d8fdb65d02a8 SHA-256: 522f8d98f7128bb2e55f83392efa36c7f76047fc01acbe7bc6026b1113b48f29
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to a link farm on disposable hosting, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/strik?utm_term=rca+tablet+hard+reset+key
    • https://cdn-cms.f-static.net/uploads/4451044/normal_6040df4e9f6b6.pdf
    • http://sufagifem.22web.org/types_of_abuse_in_relationships.pdf
    • https://cdn-cms.f-static.net/uploads/4393641/normal_60393cb6a46ac.pdf
    • https://ruxiwinovisas.weebly.com/uploads/1/3/5/3/135313790/e774672a024025.pdf
    • https://belumikifisa.weebly.com/uploads/1/3/4/6/134666155/puridegeku.pdf
    • https://cdn-cms.f-static.net/uploads/4473919/normal_60268a4d4d868.pdf
    • https://static.s123-cdn-static.com/uploads/4451561/normal_5fdf0078538af.pdf
    • https://mofuxobilewita.weebly.com/uploads/1/3/5/4/135400762/ronodebisofi.pdf
    • https://static.s123-cdn-static.com/uploads/4375204/normal_6002539c4d4ea.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xutagefev.epizy.com/ridiculous_fishing_free_iphone.pdf
    • https://s3.amazonaws.com/xufujofaleki/referencing_an_online_report_harvard_style.pdf
    • https://s3.amazonaws.com/patilawasu/frozen_throne_guide_warcraft_3.pdf
    • http://warufadul.rf.gd/free_child_care_enrollment_forms.pdf
    • https://uploads.strikinglycdn.com/files/d0fff73a-fef6-4f22-a27f-46689acb2465/spectrum_remote_guide_not_working.pdf
    • https://s3.amazonaws.com/tuxexi/free_uk_tv_guide_app_for_ipad.pdf
    • https://uploads.strikinglycdn.com/files/8e5e83ad-eccf-4bf3-95db-7639da0b3841/what_are_the_duties_of_a_special_assistant.pdf
    • https://s3.amazonaws.com/baxekojojexusol/celsius_to_fahrenheit_app_android.pdf
    • https://uploads.strikinglycdn.com/files/e5838f01-c978-46b1-bc30-3795f7cb4909/55947852419.pdf
    • https://uploads.strikinglycdn.com/files/a28cb7cb-3a29-49a8-9caf-05ddf585d5d7/wudonibug.pdf
    • http://subutolibi.rf.gd/ronubizozekutukigup.pdf
    • https://uploads.strikinglycdn.com/files/8b919d6e-ed7b-4c7c-bdac-e92d8e4dd1c0/gikejobutufofugoxasizarog.pdf
    • https://uploads.strikinglycdn.com/files/09501972-d59c-4c36-8efc-db8bec03d604/depopedefazexisukafukeju.pdf
    • http://jeragapa.epizy.com/17_day_diet_cycle_1_menus.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_off0000f1ad.bin
03b87b1e3931dfce7c41682f68107ffe0947c5897f659947b8b7aef919a3af34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AD 5340 bytes
font_01_sfnt_off000103d1.bin
69f32f618d54fe17d7283df4c6f0ed106b36849c1666f690c27763ccb8d46c1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 10684 bytes

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