Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd872cd557052b8e…

MALICIOUS

PDF

76.2 KB Created: 2021-04-01 06:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42f26a2029959a9da3edf094088ff3c6 SHA-1: a6ae9d3a8c92a74dd29c67a55625da4f63bb8280 SHA-256: dd872cd557052b8ea57543c7d30552245b2236d618ee927f0cc8718edf8a751c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one pointing to 'https://dafemum.ru/wix?keyword=format+text+discord', suggesting a link farm or phishing lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to redirect the user to a potentially malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dafemum.ru/wix?keyword=format+text+discord
    • https://static.s123-cdn-static.com/uploads/4454677/normal_5fef0a4c312ea.pdf
    • https://cdn-cms.f-static.net/uploads/4369516/normal_604f32b5d94cb.pdf
    • http://tewazezila.66ghz.com/dimugir.pdf
    • http://tubipiguposazi.22web.org/fojamitud.pdf
    • https://cdn-cms.f-static.net/uploads/4501361/normal_6049c2ee0b50b.pdf
    • https://jafipununevov.weebly.com/uploads/1/3/0/8/130814040/cc6f10486e8df3.pdf
    • https://tukobigerokigab.weebly.com/uploads/1/3/4/6/134653943/gupeli-pumadif-fufesir.pdf
    • http://gerawat.22web.org/11101495779.pdf
    • https://mavosawiki.weebly.com/uploads/1/3/1/1/131163846/sirofozaz.pdf
    • https://cdn.sqhk.co/busoleva/1jbmy5v/61948254009.pdf
    • https://piborubaladedos.weebly.com/uploads/1/3/4/7/134764427/wodugepi_wolifimijofij_pizivegoxetaxu.pdf
    • https://sobapeseg.weebly.com/uploads/1/3/1/0/131070394/3680081.pdf
    • https://cdn.sqhk.co/xexisini/ieykhae/henry_ford_assembly_line_primary_source.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bf461982-e297-4f65-ba47-919bdad5516e/where_can_i_leave_clothes_for_charity_near_me.pdf
    • https://uploads.strikinglycdn.com/files/8d28b17e-a18f-45ee-b9d8-f8f95a536014/bejivurirelu.pdf
    • https://uploads.strikinglycdn.com/files/e44aaf5e-e383-4ab1-be05-5bcebb7aee37/49791591060.pdf
    • https://uploads.strikinglycdn.com/files/bf03396f-af4b-4915-80b5-8f3710d3cf69/nigilabevosupi.pdf
    • https://s3.amazonaws.com/kezemiradigu/eib_corporate_governance_report_2018.pdf
    • http://basonitezof.rf.gd/atomic_structure_notes_for_bsc.pdf
    • https://s3.amazonaws.com/jupoti/fopisifogabonodimimogukak.pdf
    • https://s3.amazonaws.com/kukazowox/90349290623.pdf
    • https://uploads.strikinglycdn.com/files/64bad276-a42a-4a87-acaf-b73b14549e2b/how_long_to_study_for_gre_subject_test.pdf
    • http://duzixojaxop.rf.gd/pokemon_adventures_manga_vol_3.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_off0000eaf2.bin
191f3fdd65c7847ba0bfa0cab1d6a6f22534db56a8ab8f15932642954af70f5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF2 5076 bytes
font_01_sfnt_off0000fc1e.bin
809f4eacaa640d5d1bf4a93874f18d1ed15aa4148c0d4049a4427bbd0d0d87c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 11208 bytes

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