Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3bc2371f10b9a3…

MALICIOUS

PDF

78.7 KB Created: 2021-04-07 21:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 900d41f4fe31926c5d7df0186039006e SHA-1: 2f52059f7ce60133224030db0ac8c6dda495c2e6 SHA-256: 2d3bc2371f10b9a3a325aca3004448f7bc836bbd0825dcfcff890554b2dd19de
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to suspicious domains, suggesting a link farm or phishing attempt. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, with one prominent example being https://wisomekusarukit.weebly.com/uploads/1/3/5/3/135384288/gopajolidosezekol.pdf. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=first+data+fd130+will+not+print
    • https://wisomekusarukit.weebly.com/uploads/1/3/5/3/135384288/gopajolidosezekol.pdf
    • http://sitizinudex.getenjoyment.net/80108463690.pdf
    • https://cdn-cms.f-static.net/uploads/4386597/normal_5fe98f0acbdb6.pdf
    • https://cdn-cms.f-static.net/uploads/4381980/normal_6049916cb449f.pdf
    • https://vodivabowadabi.weebly.com/uploads/1/3/4/8/134877230/fozelo.pdf
    • https://putavoguxula.weebly.com/uploads/1/3/5/3/135325624/rosowuwisaxin.pdf
    • https://cdn-cms.f-static.net/uploads/4410018/normal_6039abc79d143.pdf
    • http://patajafurep.mywebcommunity.org/ibps_rrb_clerk_notification_2020.pdf
    • https://fajesafopumusid.weebly.com/uploads/1/3/1/8/131871419/f2846d50.pdf
    • https://cdn-cms.f-static.net/uploads/4481058/normal_60517e7f67749.pdf
    • https://cdn-cms.f-static.net/uploads/4480383/normal_605659f84f6b4.pdf
    • https://cdn-cms.f-static.net/uploads/4455374/normal_603fe4eb8ffee.pdf
    • https://static.s123-cdn-static.com/uploads/4488572/normal_5ffdcc9d3c4d0.pdf
    • https://static.s123-cdn-static.com/uploads/4382638/normal_5ff6610f9b6b4.pdf
    • http://xazowagef.mypressonline.com/mopumube.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tamovagag/pilot_easy_touch_pens_medium_refill.pdf
    • https://uploads.strikinglycdn.com/files/be112476-cf25-4db0-bb21-d5952f23bc92/gegukekopudorojibe.pdf
    • https://s3.amazonaws.com/pibabopuduj/typhoid_fever_in_child.pdf
    • https://uploads.strikinglycdn.com/files/a047b94e-9c7d-4c2b-93f6-62890dd75a99/the_7_habits_of_highly_successful_financial_planners.pdf
    • https://s3.amazonaws.com/wajufifenoxuj/41838062552.pdf
    • https://s3.amazonaws.com/sepawi/nitopezixabipajizopapo.pdf
    • https://s3.amazonaws.com/kovilowab/vejebokofirigivijiwuvop.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_off0000f566.bin
41a132d345dd6e516363b40f9fb7f6c174d55e28686c94f6c38fedd00abb4480		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 5440 bytes
font_01_sfnt_off00010808.bin
c5f8ba2bee9dfa9523f5909818573675a7633ec494d455e811a5a6f01535af03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 10996 bytes

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