Malicious PDF — malware analysis report

Static analysis result for SHA-256 d204935820bdbc6d…

MALICIOUS

PDF

96.8 KB Created: 2021-03-16 21:26:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38daeb1609d79a346f45568e36139519 SHA-1: 6af16677fccbbb6815cf0ebc90eb25ac8e597ea3 SHA-256: d204935820bdbc6d5482601b555652ee35fd7b1087f4009f2acda622852252de
116 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically a phishing trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were explicitly extracted, the presence of embedded URLs, including one pointing to 'kuzutuzo.ru', suggests a potential attempt to redirect users to malicious content or initiate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=husqvarna+125bt+pull+cord+replacement
    • http://bluhgang.best/vomiwujunupiwatatugekamuk327cy.pdf
    • http://firstreadersclub.com/4398911065536thd.pdf
    • https://static.s123-cdn-static.com/uploads/4467019/normal_5fe5d127e7b6d.pdf
    • http://fruit-citrus.space/filmora_7.8.9_effects_pack_free_downloadq24a6.pdf
    • https://dixuxizexejo.weebly.com/uploads/1/3/0/7/130740209/pomovedukape-desejaxiwixuza-xerajotobafoju-dobafatalipegu.pdf
    • https://cdn-cms.f-static.net/uploads/4471082/normal_5fe8fe09a132a.pdf
    • http://kersita.space/bebe_lactancia_materna_problemas3awd6.pdf
    • https://cdn-cms.f-static.net/uploads/4414159/normal_604b4f8bcbaf8.pdf
    • https://static.s123-cdn-static.com/uploads/4490934/normal_600667d5dcf94.pdf
    • https://cdn-cms.f-static.net/uploads/4366628/normal_604fe9e60d506.pdf
    • http://custits.space/xerinurojjdg.pdf
    • https://xitirume.weebly.com/uploads/1/3/4/3/134392652/c53dbc2baf.pdf
    • https://nimifitirujaga.weebly.com/uploads/1/3/4/6/134693460/befemopaj_zedaxat_bovorezoxomo_sexetapafuvu.pdf
    • https://static.s123-cdn-static.com/uploads/4384150/normal_5feee02e84fc8.pdf
    • https://muxojuwarerufi.weebly.com/uploads/1/3/5/3/135388895/zowurofiximajin_zononetu_pumanikimuzira.pdf
    • https://cdn-cms.f-static.net/uploads/4476780/normal_6012d5991f10b.pdf
    • https://cdn-cms.f-static.net/uploads/4416305/normal_6032d1987dfe7.pdf
    • https://cdn-cms.f-static.net/uploads/4491164/normal_600d612363dcd.pdf
    • https://cdn-cms.f-static.net/uploads/4416495/normal_5fdc381c8ce38.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/39acf5c1-7923-420c-bed7-b20470e0a26a/starbucks_barista_salary_and_benefits.pdf
    • https://s3.amazonaws.com/moduxanakuri/pagonimoja.pdf
    • https://s3.amazonaws.com/jixeremipet/70488555374.pdf
    • https://s3.amazonaws.com/zonebon/95604380546.pdf
    • https://s3.amazonaws.com/povodijirig/86799413926.pdf
    • https://uploads.strikinglycdn.com/files/bcc1228f-092c-4c9f-bd95-9efdf83be45f/secret_game_movie_2018_bollywood_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c4b.bin
5f40ec6843d4ce0c8f0a20223fa11806e871b90491ad6598cf36341ed509fc28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4B 5648 bytes
font_01_sfnt_off00013f5f.bin
6726977c46aa621deada7f5d502454379802840f65c863c2bb98c8984f00f285		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5F 11760 bytes
font_02_sfnt_off0001674b.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1674B 4324 bytes

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