Malicious PDF — malware analysis report

Static analysis result for SHA-256 161b717bdf964201…

MALICIOUS

PDF

74.2 KB Created: 2021-03-15 04:09:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48a5b3fc1893f6f9a81fc2466d963f8e SHA-1: baeaf4e5e8c282e06cd2f0b463a0771250d548ea SHA-256: 161b717bdf964201f74fd0f7838802059559e22d31dccd6ae852aa0d1b182866
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/123?utm_term=koperasi+permodalan+felda+malaysia+berhad+annual+report
    • https://cdn-cms.f-static.net/uploads/4471514/normal_601f66062b3df.pdf
    • https://cdn.sqhk.co/guranotup/fgdTqjh/jolofunifaxipukubexan.pdf
    • https://cdn.sqhk.co/kokojisip/OSjgKie/iphone_game_center_login_on_pc.pdf
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/kulisubo.pdf
    • https://cdn-cms.f-static.net/uploads/4421366/normal_600ed5ddc8fbd.pdf
    • https://naforuzutexas.weebly.com/uploads/1/3/1/4/131438024/metarobem_virizemomuz.pdf
    • https://nusuwexob.weebly.com/uploads/1/3/4/3/134352417/2818357.pdf
    • https://cdn-cms.f-static.net/uploads/4481847/normal_60191e57372fb.pdf
    • http://jipetabonitu.mywebcommunity.org/sububapodi.pdf
    • https://static.s123-cdn-static.com/uploads/4445532/normal_5fe0148fb50eb.pdf
    • http://rasazajafatirek.mypressonline.com/jewejibi.pdf
    • https://cdn.sqhk.co/liregagibago/fhbgfih/transformers_robots_in_disguise_season_3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/72ad52b7-2a58-469c-9f7e-18ed8d8d5e31/razer_ouroboros_instructions.pdf
    • https://uploads.strikinglycdn.com/files/8ce5badc-6518-4faf-91f0-e03ee6ba6243/2008_highlander_hybrid_value.pdf
    • http://wolobugoxew.myartsonline.com/zitebozivawatenutetasoza.pdf
    • https://s3.amazonaws.com/fekife/powerpoint_presentation_design_ideas_free.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_off0000e402.bin
4b26f4fa6f2afb3a03ecf9429ab0de7a6894a2364e0656144fd077c46cc47a18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE402 5492 bytes
font_01_sfnt_off0000f688.bin
2810b40e86c6386fb6c5fdf68954ec127900912582bf1476a813bd3bd2c476a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF688 10872 bytes

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