Malicious PDF — malware analysis report

Static analysis result for SHA-256 344eda929725189e…

MALICIOUS

PDF

81.5 KB Created: 2021-04-20 22:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1fcaa3ab84e938cd6bf2b10410513112 SHA-1: 2e33ee6a1696bb47f144553e01620c15c5f87f92 SHA-256: 344eda929725189ed257d72fac27cb1651fa54086433f8f58a38fe3260eb4264
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 0.9996

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://fokemale.ru/strik?utm_term=how+to+calculate+annual+geometric+average PDF link annotation
    • http://mibewoz.22web.org/how_long_should_a_garmin_nuvi_battery_last.pdfIn PDF document text
    • http://rajulikarizamu.iblogger.org/daxofaxugokiraguvekij.pdfIn PDF document text
    • http://netzamka.ru/penezejemanufamiler7fz27.pdfIn PDF document text
    • http://2gusevshop.space/telugu_new_love_feeling_songs_freejhk05.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gemimuraxovaxaf.rf.gd/past_simple_regular_verbs_exercises_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbeaa848-2b40-419c-9f36-c622a515ea96/fupiveg.pdfIn PDF document text
    • https://147762ec-90f0-4523-8579-43cb3cd17c82.filesusr.com/ugd/6c48b9_4570186808ee47df90e6acc447ec7a2d.pdf?index=trueIn PDF document text
    • https://165abacb-5525-4e66-971c-c167d859e756.filesusr.com/ugd/f3f2a5_3bc00c21adfb4249bbbb385968224cae.pdf?index=trueIn PDF document text
    • https://aaf8962b-2ea5-4403-bfea-7c32f2b3f77e.filesusr.com/ugd/8f3a65_01dfc11c860a45e3987898e885725339.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29311485-9d38-4217-8637-c2e6db08b639/solving_linear_equations_and_inequalities_in_one_variable_independent_practice_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62a5ef33-0eee-4ad0-a1e2-c3537d9f2577/bijatogivib.pdfIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_2c69280b76af47278e56a1272eabe0f4.pdf?index=trueIn PDF document text
    • https://6fc76513-a17a-4053-940d-bef108f5ea85.filesusr.com/ugd/3a5ef0_162013872a244031b3f2139ff423c266.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a1e6bf1-c0fc-492d-a79f-0fee75fd1e44/zuwipanewulojonokin.pdfIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_7aabb26da1644bbf864eba724aeb60d7.pdf?index=trueIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_a9ffe5c9098745a7bd68227e082fe361.pdf?index=trueIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_60cddcc8eb5d4469b720bf8bfb3de7f7.pdf?index=trueIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_e4ef35ef867047d19a4a548d5762caaa.pdf?index=trueIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_a95751a93f134746854aa998cfb4a22c.pdf?index=trueIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_023ec6eb06584157a146ec437c9ac0ed.pdf?index=trueIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_f6c176133dfe4325a62c602954eea529.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_off00010153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 5056 bytes
SHA-256: 8d50ea1d8dda1a66c2229c0867182511fe808c35582625bbcdf61a694575f161
font_01_sfnt_off00011285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11285 11008 bytes
SHA-256: 1a6f31d9dcb81ac52048413c95deb355cef1d9ef1af400fd1744eb13ea17740e