Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65ff97437016fee…

MALICIOUS

PDF

74.1 KB Created: 2021-03-09 22:49:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f6d5c3625c9f774ba4c31a8cc3103399 SHA-1: 1310a5f701641fb0ffac41da238ddb592b480a2d SHA-256: f65ff97437016feed1a483b8bd7cec54bcbef2b8293dd664be7699a569792c36
186 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, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://baarspo.ru/strik?utm_term=zagg+keyboard+connect+to+ipad PDF link annotation
    • https://cdn.sqhk.co/zasokolof/uwWibEm/fitonu.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/idihTja/tiwisavawixi.pdfIn PDF document text
    • http://tonojodozif.mypressonline.com/how_to_measure_echo.pdfIn PDF document text
    • http://golixudib.mypressonline.com/87458277506.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448103/normal_5fffe209af0e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486045/normal_6013ed9e27af7.pdfIn PDF document text
    • https://cdn.sqhk.co/rosojolude/s3aiaic/32648446758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421464/normal_602ee1856f719.pdfIn PDF document text
    • https://cdn.sqhk.co/turaxulefa/riijggf/denali.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527859/normal_601fb8f2dd555.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458125/normal_5ffb264eb8682.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_8dcd60cece94457fbe808758921146ef.pdf?index=trueIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_0e8cb38396c14943899d911a999d80c6.pdf?index=trueIn PDF document text
    • https://6754c94d-8795-460a-880d-d127bb37d4d4.filesusr.com/ugd/2383dc_302119be2ba94881b64c1732aaa2b84b.pdf?index=trueIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_a4c8c27b78d541c8821cecb34484358f.pdf?index=trueIn PDF document text
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_59d71191f23744948214579e86cb7e63.pdf?index=trueIn PDF document text
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_47bc0784bb1846e6ac64779de4850276.pdf?index=trueIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_8fb891fe05e04c3cace28098f88d4b0a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rotowan/dark_messenger_apk_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/gelitotut.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/39287435102.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/bapigodi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25F 5292 bytes
SHA-256: ed3f50dc765bb313ba9fd4891daf0ce50b01299c768c607d3ca48f505d855d30
font_01_sfnt_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 11312 bytes
SHA-256: 8de1dd5c322183a45b8ebb61c8c6e7b1265899bdf1ba3e6b0b099ae778bcc4b1