Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfef21784ddffa95…

MALICIOUS

PDF

93.7 KB Created: 2021-06-12 07:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 880507a60266332401fc45a6d7114416 SHA-1: 7ab55672d1c1a2f341fd6605ab3db1c9eabc4038 SHA-256: cfef21784ddffa9594f5aac5cf12093ce8b8998fe46084d7c4d64fdcaddbe5b5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL, 'https://catamma.ru/pbw?utm_term=positive+comparative+superlative+worksheet', identified as a potential phishing or malware distribution point. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host multiple links, further supporting a malicious lure.

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://catamma.ru/pbw?utm_term=positive+comparative+superlative+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452624/normal_606ded981617c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459636/normal_604141fae67fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382197/normal_606a2e96d6d68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454171/normal_606446b092f99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378623/normal_5fd82bd4aaf30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xifatarege.pbworks.com/f/how_do_you_write_a_security_incident_report_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc42c80f-af31-4e15-acf1-3efe1ecc37ad/que_es_el_diagnostico_enfermero.pdfIn PDF document text
    • http://tikomegeto.pbworks.com/f/42323916543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f380193-0e92-4af8-b24a-2bbf6c32f7ae/fasakopikigiropit.pdfIn PDF document text
    • http://gorixose.pbworks.com/f/why_is_a_stick_of_gum_like_a_sneeze.pdfIn PDF document text
    • http://jifesepapo.pbworks.com/w/file/fetch/144450309/how_to_take_megger_test_of_motor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35be11b6-b3fd-4b77-9bcc-e03419834ff0/me_200_past_exams.pdfIn PDF document text
    • http://gaguwufajij.pbworks.com/w/file/fetch/144767628/how_to_connect_doss_bluetooth_speaker_to_alexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f045a4c-7af2-4157-a931-cfce698d5b5f/apc_back-ups_es_700va_manual.pdfIn PDF document text
    • http://pitevaj.pbworks.com/f/verexugafevibamekerik.pdfIn PDF document text
    • http://mitamugukojo.pbworks.com/f/kowafoxigim.pdfIn PDF document text
    • http://kavuruxu.pbworks.com/f/honda_hcf-2_specification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5afb5cbe-a1ee-4670-b4f8-f10f78613f98/tonudujexipopobikifekezo.pdfIn PDF document text
    • http://lipemuv.pbworks.com/f/photography_website_layout.pdfIn PDF document text
    • http://zuvuwiro.pbworks.com/w/file/fetch/144725526/93577377645.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001320c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320C 5388 bytes
SHA-256: 7e99ab6829d7646406d89d9ca13182d799ebe494216515349899fbf9a6f9d173
font_01_sfnt_off00014446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14446 11024 bytes
SHA-256: 4dbb4ea4a3e56c6e805a8df89ce1f4b0a81df922fc5f2618ab7dff272d71a6fa

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