Malicious PDF — malware analysis report

Static analysis result for SHA-256 d527b3cf8765e4ec…

MALICIOUS

PDF

86.0 KB Created: 2021-04-03 21:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec59a3d77cf70089b45ec53bc41a1fe9 SHA-1: 2f39b5422ae97c4c0ef54a564d945e521bd2be7f SHA-256: d527b3cf8765e4ecde553e9000238eaa753737a4c5c969d9ec5668c2c915dbec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external links suggests an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://vilenefex.ru/strik?utm_term=how+to+use+gps+72h+garmin
    • https://wugepugozufov.weebly.com/uploads/1/3/4/7/134744675/vedakidetu_zebagasomepum.pdf
    • https://cdn-cms.f-static.net/uploads/4474979/normal_60371b30e2eec.pdf
    • https://cdn.sqhk.co/legesizas/jd8jcjg/retro_time_pilot_arcade_game_for_sale.pdf
    • https://sosanibizug.weebly.com/uploads/1/3/2/6/132695556/gozilux.pdf
    • https://serutoposax.weebly.com/uploads/1/3/5/3/135398922/7b9cf6773b2a.pdf
    • https://cdn.sqhk.co/nunemiziku/vYku1je/ribomi.pdf
    • https://cdn-cms.f-static.net/uploads/4404500/normal_601ed77e37682.pdf
    • https://cdn.sqhk.co/wabasenenem/bJWUeGm/1112312825.pdf
    • https://cdn-cms.f-static.net/uploads/4388842/normal_605fa2e8d236d.pdf
    • http://help-business-media.com/swot_analysis_of_pepsicojgp33.pdf
    • http://astrology-personal.online/character_traits_worksheet_for_grade_3sza16.pdf
    • https://rufekelikofevav.weebly.com/uploads/1/3/1/0/131070689/7838021.pdf
    • https://kowezuvive.weebly.com/uploads/1/3/4/6/134603832/4c393754382c.pdf
    • https://cdn.sqhk.co/vulovosovem/dUhfkih/kojupelujosalilo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://17c3d818-7f64-4152-976a-2fa997d7a7be.filesusr.com/ugd/e2c250_547d705d59764b4ca48f1a91235dcc9c.pdf?index=true
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_fbbf29082b2e4f359a17ab1f79e5bd0e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0865ae29-4e5a-4daf-b5ed-9cb1311b853c/17849636743.pdf
    • https://uploads.strikinglycdn.com/files/89e19572-944d-496c-b0af-773f01196173/what_is_bills_of_exchange_in_accounting.pdf
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_4667e1588f714a648f2d60a4c476de79.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c6c7370e-b87e-4faf-96b5-f7b466c1045c/komodozekarom.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_off000112a6.bin
c6c5e77bc5aa4cf5629ff9360c7c32d0dc9a4905157b04df1b032825902da545		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112A6 5468 bytes
font_01_sfnt_off00012536.bin
22c314ea54ea6f4c4706ead43b581f8f081372b2fa48eb983c8936be3e19d266		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12536 11036 bytes

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