Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4eb6a6d5d957d2…

MALICIOUS

PDF

131.9 KB Created: 2021-05-17 17:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 91125aa07009f50988b342bae0d0983c SHA-1: 56466d0323f3c13b198d88fd5d035ff8a4833d0e SHA-256: 5e4eb6a6d5d957d291d0fa2a869dc5e3ae5b73c3fee09470ef98398a60f318af
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 0.9978

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://golowaki.ru/strik?utm_term=citizen+nighthawk+watch+eco-drive+fb3002-53p PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379618/normal_60591fd479e02.pdfIn PDF document text
    • https://xupumoga.weebly.com/uploads/1/3/1/1/131164417/e6ffd1ce6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_6023f279d1ce7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482402/normal_5fc94234eaa08.pdfIn PDF document text
    • https://cdn.sqhk.co/niririga/hJhiieV/herpes_simplex_1_genital_discharge.pdfIn PDF document text
    • https://rutikaxa.weebly.com/uploads/1/3/0/7/130738846/265784.pdfIn PDF document text
    • https://zidepodip.weebly.com/uploads/1/3/0/7/130775192/8642462.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421050/normal_6050676bd1fce.pdfIn PDF document text
    • https://cdn.sqhk.co/somepizeko/dtThdge/bubble_shooter_game_aarp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426059/normal_60404f58a04fd.pdfIn PDF document text
    • https://famonusowofem.weebly.com/uploads/1/3/4/3/134349488/rosew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420438/normal_5fced9d92bf64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410216/normal_5fc7ca4d3f221.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369631/normal_5ff251c96d3a3.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_483a491934264bff91477df14f37a3b4.pdf?index=trueIn PDF document text
    • https://3b87a2b8-2d13-4e6d-acc4-cbba57692a59.filesusr.com/ugd/50988c_3e2853f609f74680a414bb7ae004459e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/reading_strategies_for_struggling_high_school_students.pdfIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_1f40b2c210b24492a9512f3bac445bae.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_7ccfb1747dd141a09f453f17c0dd69a4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovilowab/petijuludalonikoborirake.pdfIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_5b45ad42f97143e885ff6baa5d79fa28.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/63566173604.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/77888260221.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_off0001b6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6C8 1768 bytes
SHA-256: d698744f837609a0c479a5c9552ce734b7e7a4b968974a977ed2ff9dfe46e2b1
font_01_sfnt_off0001bf35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF35 6112 bytes
SHA-256: 54cbb7667c1af57bdf4a81b83538c352404a687cfd6d13b4b1439ae73ba9ad9b
font_02_sfnt_off0001d428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D428 13336 bytes
SHA-256: ad0e363cafeb735c6eebf7b247f1eeb5c2a6214166e6d04d8106b670051569cf