Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b923e909e67934…

MALICIOUS

PDF

75.5 KB Created: 2021-03-20 06:40:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 152a37c0b9343beda98f59674c3e007f SHA-1: 41f244ded15d1a0f302d620599315983e3ab9025 SHA-256: a7b923e909e67934f5fd0ade19ee23f5aee6b7ed93fd40b348408b59c0098c0b
156 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is malicious and attempts to lure users by requesting sensitive information, such as recovery secrets or private keys. It also embeds external URIs, suggesting it may download additional payloads or redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/award?keyword=pdf+file+resizer+app
    • https://cdn-cms.f-static.net/uploads/4424025/normal_602c0cf27b540.pdf
    • http://sandwichhq.club/59382105852igsqq.pdf
    • http://generatorsale.ru/where_is_the_flame_sensor_located_on_your_furnacenjloy.pdf
    • http://mmuuue.space/29621257402jv6nq.pdf
    • https://static.s123-cdn-static.com/uploads/4380411/normal_5fdfeee31392a.pdf
    • http://online-sistem.site/hp_officejet_pro_l7680_inkbq2ya.pdf
    • http://soluzixod.66ghz.com/resunamineda.pdf
    • http://dudisukogonox.iblogger.org/bollard_pull_test_procedure.pdf
    • http://gemajesubon.22web.org/math_worksheets_fractions_5th_grade.pdf
    • http://vududodudo.22web.org/gatutotubonatezujoxutoko.pdf
    • http://rasprodavaika.ru/baby_bjorn_bassinet_used9nbmf.pdf
    • http://neo-tp.ru/how_to_describe_your_corporate_culturehp2aj.pdf
    • http://cenderaoriginator.com/jibubogctgju.pdf
    • http://idealslim-italiaofficial.site/task_delegation_templateu5ks8.pdf
    • http://myfavoritesun.xyz/hp_deskjet_2620_black_ink_not_printingoitzt.pdf
    • https://cdn-cms.f-static.net/uploads/4445104/normal_602b0439bcbe2.pdf
    • http://1green.space/129904412214jtwz.pdf
    • http://javopivabo.iblogger.org/20512864419.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zebajufomig.epizy.com/android_developer_course_in_nagpur.pdf
    • https://uploads.strikinglycdn.com/files/381b3ca0-795b-43b6-a1e3-a0d014811422/10546682215.pdf
    • http://giwokekurodi.rf.gd/35810282378.pdf
    • http://xubaforan.epizy.com/22912406070.pdf
    • https://uploads.strikinglycdn.com/files/46d94293-8da8-480f-b6ab-87d1545997a5/xivesuvowitezamodukelabu.pdf
    • http://betiravel.epizy.com/7285021114.pdf
    • http://sujotoginejo.rf.gd/hotmail_app_for_pc_64_bit.pdf
    • https://uploads.strikinglycdn.com/files/8165e4e0-dc0c-4b68-bc00-0c7d8a5c720f/zarametadubogupoxikaw.pdf
    • https://uploads.strikinglycdn.com/files/6a7eae7a-c5b3-4b2e-8887-e3e51b7d354e/95707743970.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_off0000ec49.bin
600d4344cc7700c05b2bb438a0932794aede002b073ab1ad1391b0194d2bdd5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 5088 bytes
font_01_sfnt_off0000fdaf.bin
f4a73278a511654422e9d7aac6cbad673e6924d96b7e446ef7a7c5b09d3b998b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAF 10224 bytes

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