Malicious PDF — malware analysis report

Static analysis result for SHA-256 d388a755bc555cfc…

MALICIOUS

PDF

84.4 KB Created: 2021-03-14 11:38:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 863af24442559a03a9b4040234202e35 SHA-1: b57e19ec51c2b7c6fbba8930aa8beed6d09ec4b7 SHA-256: d388a755bc555cfcdcb374510238eb926b3bf0285b1c367b6cebcca515c15e34
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or directing users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm for SEO manipulation or to host various payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=raging+planet+hurricane+worksheet+answer+key
    • https://static.s123-cdn-static.com/uploads/4452154/normal_60045bd4cbefa.pdf
    • https://wuzovogupo.weebly.com/uploads/1/3/4/7/134720757/kisugupa.pdf
    • https://pepizowa.weebly.com/uploads/1/3/2/7/132711999/mesikatosimeru.pdf
    • https://vuwapelenepaje.weebly.com/uploads/1/3/4/7/134705438/5674973.pdf
    • https://gojefofowuf.weebly.com/uploads/1/3/4/5/134596001/nenivelo-vatenod-susozogivime-fitiwetagajupam.pdf
    • https://cdn.sqhk.co/sezunofubuzi/gehcoja/general_hospital_episodes_this_week.pdf
    • https://cdn-cms.f-static.net/uploads/4477401/normal_6046e039533d2.pdf
    • https://rababavuve.weebly.com/uploads/1/3/1/8/131871532/nugorolukafegu.pdf
    • https://vipobonufemug.weebly.com/uploads/1/3/5/4/135401160/45066551.pdf
    • https://namatevugaveri.weebly.com/uploads/1/3/4/3/134350782/jivirezep.pdf
    • https://static.s123-cdn-static.com/uploads/4469617/normal_60043514a8900.pdf
    • https://sajosapisede.weebly.com/uploads/1/3/4/3/134344890/d4ca8a517826cc0.pdf
    • https://cdn.sqhk.co/pimibopugugo/Hii0hgq/lifimenevol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3df06c22-1e8a-4082-8cc2-a0fdc0609706.filesusr.com/ugd/d86e81_7dd9b89da61841efa1800efbced96c5b.pdf?index=true
    • https://s3.amazonaws.com/pezofut/52560639733.pdf
    • https://96ea5dd8-6962-4d57-b29c-fb233a715e3b.filesusr.com/ugd/ac3463_9224c1573d21463d9c5802ce64295553.pdf?index=true
    • https://s3.amazonaws.com/mikibetiv/29192741087.pdf
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_502455650fde4eafa648aa5f34552ddf.pdf?index=true
    • https://s3.amazonaws.com/fovezewi/juxowidugujowepewenama.pdf
    • https://s3.amazonaws.com/bewibiwat/do_salt_water_pools_have_magnesium.pdf
    • https://57ead060-d7b3-4f59-a803-6c9b47c0028a.filesusr.com/ugd/f30481_3c177c61829649788e0ee56a7fca1298.pdf?index=true
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_8a83875d5f374905adc8cd13f0e5e755.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_off00010b08.bin
99f9ddc669f59e5a72127a068b5fc01251eb7d1615bce54c90928232adabaccb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B08 5460 bytes
font_01_sfnt_off00011db3.bin
ba28c0c7703925f17a26ccf5d2eada26b6084917b3172ce472dcfc99cd70171f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB3 11304 bytes

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