Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d8476f5f231598…

MALICIOUS

PDF

80.2 KB Created: 2021-06-10 08:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 72ba4ed7e49ed47590ca3e638b03ec1c SHA-1: 224efe4519c44e5927ffc42762fb867cbcce836a SHA-256: 98d8476f5f231598aaa591ae17331bfd89162588500a450c011fcd3a9ff8a964
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary external URI pointing to 'https://catamma.ru/pbw'. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'Aprender coreano pdf completo', likely a pretext to drive traffic to the malicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://catamma.ru/pbw?utm_term=aprender+coreano+pdf+completo PDF link annotation
    • https://zikosijuwuxaben.weebly.com/uploads/1/3/7/5/137513753/verivebesolaxamerib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373768/normal_606e95f00512e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_5fd677e8cc9b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496204/normal_5ffd65f325863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403540/normal_6014d4f055f53.pdfIn PDF document text
    • https://wosudinaxek.weebly.com/uploads/1/3/5/2/135299586/2919833.pdfIn PDF document text
    • https://nejalebemenogun.weebly.com/uploads/1/3/1/0/131070187/mowoke-tizirudidugoze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375210/normal_60283d1c7a34e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405459/normal_60175c7a9302a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449603/normal_5ffc99ddd567e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sijomirurefi.pbworks.com/f/what_is_free_parking_in_monopoly_gamer.pdfIn PDF document text
    • http://nigezid.pbworks.com/w/file/fetch/144416958/resignation_letter_format_in_word_hindi.pdfIn PDF document text
    • http://joxupakager.pbworks.com/w/file/fetch/144626484/what_is_dcf_certification.pdfIn PDF document text
    • http://rukutuxeriro.pbworks.com/w/file/fetch/144995532/53415982254.pdfIn PDF document text
    • http://gogoporiwo.pbworks.com/w/file/fetch/144944178/parogodasodulubexaben.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144427224/what_is_academy_sports_return_policy.pdfIn PDF document text
    • http://faxofapuf.pbworks.com/f/pre_authorized_debit_form_scotiabank.pdfIn PDF document text
    • http://wetavun.pbworks.com/f/xoxekuguzegigu.pdfIn PDF document text
    • http://wenitat.pbworks.com/w/file/fetch/144773118/29541272340.pdfIn PDF document text
    • http://munonoraze.pbworks.com/w/file/fetch/144802452/principles_of_organizational_behavior_13th_edition.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/f/71725162281.pdfIn PDF document text
    • http://vonodatob.pbworks.com/w/file/fetch/144871209/kenokatukejepigetajanud.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 3840 bytes
SHA-256: e0ae2e3904858c747e8dba6133bfa06f276431f5a05e169b8165fbeeb8c3b99b
font_01_sfnt_off0000f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 5112 bytes
SHA-256: 1fd703a5a351ad40743056205878e3bff2dcaf14d20e6673f47bf1e0877e3dbc
font_02_sfnt_off00010aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA6 12148 bytes
SHA-256: 17cf87c7d7f7354d9b066e44e5b70428f5027600b36c24be438c7f6fba7456f8

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