Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e9c171a8ac45c6…

MALICIOUS

PDF

76.8 KB Created: 2021-04-21 20:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bee7a4e65e5384b5d764c0892eba92d7 SHA-1: 992306a2c5863959654a5a73a1e5870079f76eee SHA-256: e7e9c171a8ac45c6480df0305e34749c028b4b0e7ee16c0de7ab56ecb8264140
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=football+coaching+drills+for+5-6+year+olds
    • http://lasleymarkt.ru/zutesnvwfw.pdf
    • http://afracheat5.xyz/vazeropofapozokosy.pdf
    • https://vimosetadasosus.weebly.com/uploads/1/3/2/7/132740377/sepapenufarovupeza.pdf
    • http://mantenancie.com/1565103601r6oq7.pdf
    • http://takodevizol.iblogger.org/how_can_i_my_twitter_account.pdf
    • https://mitosimizede.weebly.com/uploads/1/3/4/3/134372473/gijejufolex-suxizipiko.pdf
    • http://totalcreditcheck.info/how_to_start_a_honda_gcv160_pressure_washerjjoot.pdf
    • https://dixosejut.weebly.com/uploads/1/3/1/8/131857981/poworuj-xapixemakafob-sizize.pdf
    • https://gaxezoxo.weebly.com/uploads/1/3/0/7/130776828/9343005.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7e5ed310-bbde-4ada-be70-f815b8320837/10867774603.pdf
    • https://uploads.strikinglycdn.com/files/20de361c-2e23-472a-8b63-327b9431d1e4/tiledolatedanug.pdf
    • https://uploads.strikinglycdn.com/files/822ecfbc-4c37-486b-a78c-f7e6cabf112b/vipodedelofazom.pdf
    • https://uploads.strikinglycdn.com/files/b139aa08-f533-4311-b62b-4cd57d14485e/how_often_to_drain_a_portable_air_conditioner.pdf
    • https://uploads.strikinglycdn.com/files/d3dd1de9-d5d9-49ae-a3ee-1ef46009cb32/cooks_single_serve_coffee_maker_instructions_ninja.pdf
    • https://uploads.strikinglycdn.com/files/1bba159d-9a2d-4435-aa27-2796468aca39/88451847223.pdf
    • https://uploads.strikinglycdn.com/files/a7725598-1bae-4361-8fbf-7d1e7a7b2d52/feliro.pdf
    • http://mazogatu.epizy.com/what_is_another_word_for_best_practices.pdf
    • https://uploads.strikinglycdn.com/files/2464e6c6-d468-47d1-bc5c-b29d7f465978/app_to_turn_photo_into_avatar.pdf
    • https://uploads.strikinglycdn.com/files/a8e028f1-92cc-4ae6-8f84-985e5b95d5fc/junior_mechanical_engineering_jobs_ireland.pdf
    • http://nugetagu.epizy.com/amumu_guide_s9_jungle.pdf
    • https://uploads.strikinglycdn.com/files/877893e3-ae63-48cf-abd3-fc479711d05e/97013677298.pdf
    • https://uploads.strikinglycdn.com/files/f2828750-f374-463f-8e3c-2d87e801f6da/when_was_the_samsung_galaxy_s5_active_released.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebde.bin
bf8c67efe37161490668e7166573e30cd297b7e22bb3b1c6bf4baf808b36bd32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 5792 bytes
font_01_sfnt_off0000ff9a.bin
e9b2e0890a3dc12244ad4923e1d603f710ea2b09941d44f2415d1bfb54b3ba03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9A 11228 bytes

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