Malicious PDF — malware analysis report

Static analysis result for SHA-256 3619aa6b11dedf03…

MALICIOUS

PDF

67.6 KB Created: 2021-03-28 17:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 13c41d5ae371254a17a548b8e782a24d SHA-1: 13c60097841e7ae1c2e9b61e80d2b4663a5c39c7 SHA-256: 3619aa6b11dedf0384ed91ca683158ff2e25b5aa33ce0ccd9ce199bf7ffb485f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • 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 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://dafemum.ru/strik?utm_term=past+simple+present+perfect+exercises+pdf+macmillan PDF link annotation
    • http://sdfsdfsdf.shaketorch.com/what_is_the_setting_of_all_the_bright_places.pdfIn PDF document text
    • http://com-signto5.xyz/best_online_drug_guide_for_nurses7vy4o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482230/normal_5fe428687b445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462726/normal_6030d32b2ccbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373508/normal_5fe6ca3b741f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475725/normal_604db41323ac1.pdfIn PDF document text
    • http://russianpatentexpert.com/25315229300h7ryi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458150/normal_5fcaacab3117e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_ae7b1d04b4b94b1ea2f1b5415def0e06.pdf?index=trueIn PDF document text
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_83cf915dd5c046c188c0ff295ae133a1.pdf?index=trueIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_b476fdb6b98b454c9a2573050ea4e299.pdf?index=trueIn PDF document text
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_c9ff379c43c84ef2b19b254d36301b56.pdf?index=trueIn PDF document text
    • http://nedifig.epizy.com/72329946503.pdfIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_cc847a545e474d589a06b9fa5ad2b8e3.pdf?index=trueIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_854192a84b73454492761a276eecd545.pdf?index=trueIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_4f822e511eef4c66b15536b2e705d556.pdf?index=trueIn PDF document text
    • https://63c031ef-a76e-4574-b6c7-b683c5cdde0f.filesusr.com/ugd/3a5e7a_fc4ed5b02634413b99acc02d214c4dd0.pdf?index=trueIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_9f5e09ecbe8946929e8662edf7041fb8.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_off0000cb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2A 5372 bytes
SHA-256: 8a193dbda5d4cec3c0f5c2187f3069fdd3a108e7432ad5ed058352341e5d0903
font_01_sfnt_off0000dd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 10312 bytes
SHA-256: 93dad284bf3b1f5c0d6fc20a016363365d5ae9132510864b45d2c0dc67745142

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