Malicious PDF — malware analysis report

Static analysis result for SHA-256 552f9ea88e877eb7…

MALICIOUS

PDF

94.5 KB Created: 2021-04-12 13:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 82a4f06144915307aa3d3ef251c8c974 SHA-1: 954b26158dbff1f675a281de3f181a7243801bc6 SHA-256: 552f9ea88e877eb796db9f2acd85037f8ed770808ca18901e989b506070b262d
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to 'kuzutuzo.ru', which is likely a malicious domain used to host phishing content or distribute further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to redirect users through multiple domains, further supporting a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=the+magicians+season+5+netflix+release PDF link annotation
    • https://kabugumaka.weebly.com/uploads/1/3/6/0/136099465/7255742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379960/normal_6018f7862af3a.pdfIn PDF document text
    • https://kotezoxeruv.weebly.com/uploads/1/3/5/3/135345651/067b94e168e9dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495999/normal_5fe161f9838ad.pdfIn PDF document text
    • http://nonly.xyz/dasgupta_algorithms_solutions_manual8fok0.pdfIn PDF document text
    • http://astrology-personal.online/39195658634w80q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425728/normal_605d69f3522f5.pdfIn PDF document text
    • http://lovewaits.ru/ancient_civilization_persian_chart78a38.pdfIn PDF document text
    • https://xopilujipuwoka.weebly.com/uploads/1/3/4/8/134886601/960474.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369317/normal_5fc93162d2946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452595/normal_605439859e421.pdfIn PDF document text
    • https://sapilijufidukuw.weebly.com/uploads/1/3/4/9/134901451/lezopazezesu.pdfIn PDF document text
    • http://idealica-columbia.site/how_to_activate_tableau_license_offlinexzrc4.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xokebore/jabirovibemunakufobudubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f09975b-c727-4374-b3b6-fe355fe4e05f/christian_worship_supplement.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/manual_of_sensorless_brushless_motor_speed_controller.pdfIn PDF document text
    • https://deed868a-3c3f-4b0d-b3ae-f9ebe8a38c33.filesusr.com/ugd/95283b_6284bbae9d034ef898850ad0f526b49c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5929d40-854d-45e7-8383-1ba7bc96650c/the_dream_of_the_rood.pdfIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_7d824052cb55419c88c95eb8013d0d4b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/ministry_of_health_uganda_guidelines.pdfIn PDF document text
    • https://3abcc933-4059-444f-8e65-7077e95f005f.filesusr.com/ugd/44645f_2777a82ce9f14d59987a86237c7fd6b9.pdf?index=trueIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_9b61149dbd4745bca872e2b2cca84c29.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nademopor/daru_badnaam_kardi_song_raagsong.pdfIn PDF document text
    • https://8b7199fc-a029-4910-8138-caee300d1cbd.filesusr.com/ugd/da8f68_49f6b871d1bd454ba1ae475d30c996f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dba76d3-5bdb-4d4d-8621-6da470abb30b/what_is_cos_180_-_theta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bcf7a3f-241c-4be2-b700-a7f06b4129f8/kexavujis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac42d3e4-0f85-4d9f-8dbb-fb3ee26d6aab/blood_bowl_2_legendary_edition_ps4.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000131eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EB 5436 bytes
SHA-256: 3eb71b3c2519400bd24bd837f78108a96f9b2f24dd0577e1a3fc2a168050f84e
font_01_sfnt_off00014450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14450 12204 bytes
SHA-256: 7d35631fa1ce38fe8e776dd664b2092f1a68f602c7b6ff4e23073557bd6f5247

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