Malicious PDF — malware analysis report

Static analysis result for SHA-256 37bcc8625c5204d1…

MALICIOUS

PDF

79.7 KB Created: 2021-03-31 11:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 27ecaea0f4d89ea6543b6303320f0090 SHA-1: 5f86ea973dce777b970116167f59806837ef88a6 SHA-256: 37bcc8625c5204d13395b56afb1a7c080748e247725346c86954007baa90a5dd
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/wix?keyword=badger+sotar+2020+slim PDF link annotation
    • http://kobopez.mygamesonline.org/smoking_and_spontaneous_abortion.pdfIn PDF document text
    • http://gojewemiwegu.iblogger.org/marketing_concepts_and_strategies_dibb_download.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/how_to_create_flip_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374198/normal_6062d9c27e294.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403672/normal_6000c020ec4bc.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/51158501187.pdfIn PDF document text
    • http://toxinudi.22web.org/tiger_rice_cooker_jba-t10u_manual.pdfIn PDF document text
    • http://vimabanu.sportsontheweb.net/ecocardiograma_transesofagico.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_399fa34755064010a3da5d5bcb796b6b.pdf?index=trueIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_545f65b34bc542c99d6df17ad1de3021.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_53e69b1271804773be5c5954ca27f46d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovilowab/logujixiwezu.pdfIn PDF document text
    • https://6f46ab72-b8e3-4ec2-8f01-cb5d6491dab7.filesusr.com/ugd/9a120b_1a319cc5d4434e65a6d6133c8c02929c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/taturi/compelling_wealth_management_conversations.pdfIn PDF document text
    • http://vavazewesepato.epizy.com/does_knuckle_cracking_lead_to_arthritis_of_the_fingers.pdfIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_c0a829f9acb849229b017e7bc7d9e811.pdf?index=trueIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_91ae0ab5db524a599bbb65ed0f298565.pdf?index=trueIn PDF document text
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_9f77ce2a19c84450b71ec5c94d9efbdb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/lodufigibutigut.pdfIn PDF document text
    • http://jizuwugi.rf.gd/19901512327.pdfIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_d195390ace3b475a8f52e4bdbd78cab0.pdf?index=trueIn PDF document text
    • http://pikoritefum.epizy.com/does_the_maserati_granturismo_have_a_ferrari_engine.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_off0000ebbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 5152 bytes
SHA-256: e6f5401214f1d0ba26169c7aec2f66c373115d0dafee8c6c0df9e883126d94bd
font_01_sfnt_off0000fd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3C 11312 bytes
SHA-256: eee3879cef4ef4060d27ef913280ef60ad9c1cfae73492cc12349c667c24ac0e
font_02_sfnt_off00012364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12364 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f