Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aabfdaff1030cca…

MALICIOUS

PDF

72.5 KB Created: 2021-04-02 01:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3d232d3b6da06a265b9bfe7f82eb6d9 SHA-1: 7cf7b1b2e282ef6924aa423c8e5cb750817df276 SHA-256: 7aabfdaff1030ccac29d464ff9d7d53af162145ad649ef195dd01063388bd731
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with critical heuristics indicating a lure for recovery secrets or private keys. The presence of external URIs and a heuristic matching 'curl_watch_service_centre.pdf' suggests an attempt to download and execute further payloads. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://kuzutuzo.ru/wix?keyword=meshify+c+mini+manual
    • https://static.s123-cdn-static.com/uploads/4379471/normal_5fc8d03f87f04.pdf
    • https://cdn-cms.f-static.net/uploads/4417992/normal_60594e3c7ac61.pdf
    • http://setlyb.online/lirale5bcfm.pdf
    • http://lbaranaydin.com/39815712469jewa8.pdf
    • https://cdn-cms.f-static.net/uploads/4416802/normal_604e872d1246b.pdf
    • http://update-win20.online/how_do_i_sell_bitcoin_on_cash_app53qi1.pdf
    • http://online-sistem.site/eur_1_certificate_templateoovz4.pdf
    • https://static.s123-cdn-static.com/uploads/4463272/normal_60002030748d1.pdf
    • https://cdn-cms.f-static.net/uploads/4490534/normal_60301bd039d88.pdf
    • https://cdn-cms.f-static.net/uploads/4497075/normal_605a414fca01c.pdf
    • https://cdn-cms.f-static.net/uploads/4383327/normal_6022d3fc634ef.pdf
    • http://triple-doska5.club/mathematical_analysis_walter_rudinly30y.pdf
    • http://update-win20.online/how
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tigefaxoweta.rf.gd/thermal_power_plant_advantages_and_disadvantages.pdf
    • http://radopafoxewu.rf.gd/que_es_psicologia_del_color.pdf
    • https://uploads.strikinglycdn.com/files/c4a4973a-eda6-4ebc-bfff-ee120d687931/social_theory_roots_and_branches_5th_edition.pdf
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_4bd1594dcd814f6f89a94e9ec7684b71.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e11dbaf6-6e2b-4f33-acd5-5db04a070991/nitelufonifidowene.pdf
    • https://uploads.strikinglycdn.com/files/47b2ae52-5625-4ec4-87b4-0df90b7d5284/rip_curl_watch_service_centre.pdf
    • https://uploads.strikinglycdn.com/files/290c19ec-ef25-4600-a282-b8019b1fd429/baby_nigerian_dwarf_goats_for_sale_nc.pdf
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_929ffac69a4f4f9eb96e3acb3acfda82.pdf?index=true
    • http://vajubugi.epizy.com/algorithmic_trading_winning_strategies_and_their_rationale_ernie_chan.pdf
    • http://jogatitow.epizy.com/angularjs_interview_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/a8720965-d79a-48ab-a650-2b119126b377/pijepi.pdf
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_50a187afeebd4b989d3bc0ea64d9a6d6.pdf?index=true
    • 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_off0000def2.bin
4aacb38eade7a5aafef8cf60e4f169b56bb446c5223a1e524121c17c8534cdf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF2 5132 bytes
font_01_sfnt_off0000f05c.bin
b6d1536a814b197e5d30865df412179621841b029e92b44377a165a26c5d939f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 10588 bytes

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