Malicious PDF — malware analysis report

Static analysis result for SHA-256 9385d1149c2e217c…

MALICIOUS

PDF

75.2 KB Created: 2021-03-30 01:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69d8f6dd88a35756f1bcb70fa20fc17e SHA-1: 6235a23114dcf95a74e090f2d6c05d841a4a0d84 SHA-256: 9385d1149c2e217c5d4696c83a7b036f1d4606f1ee4d65f4f78881728dcffd30
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to other PDF documents, indicating a link farm or SEO manipulation tactic. One of the extracted URLs, 'https://dafemum.ru/wix?keyword=bulldozer+toy+remote+control', is directly associated with the document's content and is likely a malicious lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=bulldozer+toy+remote+control
    • http://stal-kemerovo.ru/dungeon_chronicle_mod_apk_latest_versionpdxg9.pdf
    • http://sadovik.me/chiari_1_malformation_measurementv0cwz.pdf
    • https://bizotimugir.weebly.com/uploads/1/3/1/1/131164076/gefewaxiredad.pdf
    • http://eagleaff.com/pimivukerujapolib2v38b.pdf
    • https://kewojuposadut.weebly.com/uploads/1/3/4/3/134374438/b4ae7a83e37.pdf
    • https://kisuvali.weebly.com/uploads/1/3/1/1/131163683/buvumofikad.pdf
    • https://kudaxemukuwofi.weebly.com/uploads/1/3/4/6/134691428/4457346.pdf
    • http://pe50off.pro/12925161104einni.pdf
    • http://pefumaviba.22web.org/sesafumipabidiwakapezufig.pdf
    • https://gojufoviwovefu.weebly.com/uploads/1/3/4/5/134515133/davup.pdf
    • http://confirmationhelpcenter.com/rebanemomukixejabcpxfj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_d801519fa88e4342a0e853226a8750d4.pdf?index=true
    • https://s3.amazonaws.com/luropi/xidiz.pdf
    • https://s3.amazonaws.com/kumasala/98017456161.pdf
    • http://supetok.rf.gd/how_to_reset_dimplex_fireplace.pdf
    • https://s3.amazonaws.com/runuzitexokol/copd_nice_guidelines_2019.pdf
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_7e3a779177cc47cf884e9b8621a8f188.pdf?index=true
    • https://s3.amazonaws.com/gupojakami/zezetezebosididixapukaji.pdf
    • https://d1e6aceb-f258-402f-b59e-92ecb386693c.filesusr.com/ugd/2cc58f_fdef40fe4ecf4991a656d831f16f1d05.pdf?index=true
    • http://lagunuriteg.rf.gd/kamus_bahasa_sunda_lengkap.pdf
    • https://s3.amazonaws.com/sazixipame/65586224325.pdf
    • http://xumomevafuvozup.rf.gd/formation_of_carbanion_ppt.pdf
    • https://s3.amazonaws.com/zijivevip/can_we_use_raspberry_pi_instead_of_arduino.pdf
    • https://s3.amazonaws.com/viboxikuz/navy_recruiting_ribbon_gold_wreaths.pdf
    • https://s3.amazonaws.com/daniwodug/gizaluviwerikewot.pdf
    • https://s3.amazonaws.com/wutezigojuxi/cue_card_follow_up_questions_with_answers.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_off0000e806.bin
42c362eeba9295a0f3f73d7fa978df18ccabdb44fb08d1bd0ac2d5f294bbbb31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE806 4896 bytes
font_01_sfnt_off0000f8a7.bin
cae5aca25dc4948661a8cce546ec83aa75de00a77b5d0a2dc1bf69fcbe1474db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 11348 bytes

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