Malicious PDF — malware analysis report

Static analysis result for SHA-256 21637a06a9b7357f…

MALICIOUS

PDF

77.7 KB Created: 2021-04-12 07:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 559b9b83afe7d5e68f376e97cf8fedc0 SHA-1: 57a4d642cc2fabd4fdaa20da0c8e566c21518fc7 SHA-256: 21637a06a9b7357fd2246880d3ea92300fbbc738a5ec8d719fb145dae3f3f2f4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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/strik?utm_term=hp+w2207+monitor+cost PDF link annotation
    • http://fidofawi.medianewsonline.com/wozidadukujalipasa.pdfIn PDF document text
    • https://cdn.sqhk.co/pasezateda/GT6gjif/84452671980.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/6hjFwjd/general_hospital_spoilers_march_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419628/normal_605d70de61677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488323/normal_603ee8f41d80b.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/how_to_test_dt466_injectors.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/hbhaigh/at_t_watch_tv_roku_app.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/dawalabevalituxenurizaves.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455657/normal_6013267866f42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410190/normal_606666845dd53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_6049f12b260a7.pdfIn PDF document text
    • http://pewekelexu.mygamesonline.org/how_to_learn_lean.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/hesjgta/old_paper_background_vector_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a541a47-a438-493e-a1a9-b3f2e296e65d/what_is_a_personal_goal_example.pdfIn PDF document text
    • https://f1fb087f-5d49-4061-aa02-230b108315d3.filesusr.com/ugd/645068_65a5745af2594da7bd5971976cf4872f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a39eee0-17e5-4bd9-9f75-b24be13a1e3d/gesaxapu.pdfIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_b4216c424f484493ad622fa7b086bcb8.pdf?index=trueIn PDF document text
    • http://jowawaba.atwebpages.com/19676732720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19e1a33d-ec1a-4eca-921f-b2284aba6b06/56833615606.pdfIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_8bb9f275df224d34a832fba1950cd158.pdf?index=trueIn 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_off0000f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 5244 bytes
SHA-256: f6449c0f8656fa3574d26007ece6b694e8b1da68345bb8cff9c3e4aebf80065b
font_01_sfnt_off00010335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10335 11168 bytes
SHA-256: fa60d5b551a94bfa09a48d8c21ac2e611fe2adc42ec3f482f0fc71415ad973bc

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