Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24a288c78da7699…

MALICIOUS

PDF

85.2 KB Created: 2021-03-15 20:31:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aea827267e1858b4b05b83b2878c456d SHA-1: 13dac1f19a32d7eeff676fed76d2cd57d229080b SHA-256: f24a288c78da769998f68929bfe001f2a38c235187d1f04cee9825019cc892b9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external links, with one prominent URL suggesting a lure for a 'free adobe pdf printer download'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, a common tactic for SEO poisoning or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/award?keyword=install+adobe+pdf+printer+free+download
    • https://cdn.sqhk.co/viwedanej/zidXgie/73675018437.pdf
    • https://cdn-cms.f-static.net/uploads/4413563/normal_603d384d47aa9.pdf
    • https://cdn-cms.f-static.net/uploads/4455659/normal_60438d59460b2.pdf
    • https://cdn.sqhk.co/kikutajaz/3ibjdAo/nagidagajexazunulesodute.pdf
    • https://cdn.sqhk.co/dijabidasu/jdji2ie/billie_eilish_wallpapers_2020.pdf
    • https://cdn.sqhk.co/binebelezux/Oheijsu/to_do_list_definition_francais.pdf
    • https://cdn-cms.f-static.net/uploads/4425533/normal_604112803c3ff.pdf
    • https://static.s123-cdn-static.com/uploads/4486200/normal_600418e48c974.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://411563d6-f1a1-4768-9eaa-86e4eb1f1ae3.filesusr.com/ugd/6d8349_adaf26ef75d64cbe81c83d15ff100686.pdf?index=true
    • https://849cba27-c1c2-4801-a47f-514a08c45c3c.filesusr.com/ugd/7f7a2c_79abfcd624664a859df5ce11a5430ca6.pdf?index=true
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_e2885142cd05491faed6d85e158b74ef.pdf?index=true
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_cd724097ec0a405c964deb1c8ca15591.pdf?index=true
    • https://s3.amazonaws.com/fadupazageraf/kenmore_high_efficiency_washer_manual.pdf
    • https://s3.amazonaws.com/teximikamukubo/sidexatadegubi.pdf
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_d45e269be0e44464bc441d951d9713fe.pdf?index=true
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_a1742a634f824ee0a8c8dcff6977aa66.pdf?index=true
    • https://s3.amazonaws.com/nisoxow/gakozajisita.pdf
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_326759b899544fae88c118dd1066002f.pdf?index=true
    • https://f621ecf8-e26c-4db3-9bdf-176eeceb312d.filesusr.com/ugd/b3755e_a1248407c1f24211bf07710035753e6a.pdf?index=true
    • https://s3.amazonaws.com/jazamerijekufol/jipedoletomup.pdf
    • https://s3.amazonaws.com/satudifin/rowizujoriwesipopo.pdf
    • https://7292b199-6d7c-4e84-b646-7854114497ba.filesusr.com/ugd/53361e_0159a6125320449dadb3f6dd60b282c8.pdf?index=true
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_197511d13a1a44e8ac3adea352103345.pdf?index=true
    • 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_off00010fc6.bin
be04ce39945fb2401ac43f73c10f85c960fdd63519e494e5141620b33e23bf09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC6 5204 bytes
font_01_sfnt_off00012193.bin
ad8ab9939c614616597c7f5677e18db76f6cab088c743fe896fac028f6d2e979		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12193 11112 bytes

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