Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e4b82fdc281bc5…

MALICIOUS

PDF

72.3 KB Created: 2021-04-03 14:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 70a7566d558d60aabed29ab0d637cae0 SHA-1: 5ba448cf8d9c351f84717fa9e9fcc95be7c6b24e SHA-256: d3e4b82fdc281bc5114ec28e7b0e0270b3fa5528e71e17882063d467732d65dd
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic indicating a link farm designed for SEO manipulation. One of the primary external URIs points to 'fokemale.ru', which is suspicious. ClamAV also detected the file as 'Pdf.Phishing.Trojan', further supporting a malicious classification. The presence of embedded links and the ML classifier's high confidence suggest this document is part of a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://fokemale.ru/award?keyword=medium+access+control+in+wireless+networks+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485943/normal_60503c67f374e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477400/normal_5fe13b08a198b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423750/normal_5fd67e4c6219a.pdfIn PDF document text
    • https://wutowenejeboz.weebly.com/uploads/1/3/4/5/134599911/lerirumewikodemiku.pdfIn PDF document text
    • https://rejileju.weebly.com/uploads/1/3/4/3/134335231/xoberogumilige-raduvedoxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451368/normal_601e94f52fcb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501208/normal_5fcf8c4056bd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484156/normal_60322a819afce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ximupuv/35734705482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbf6d8e7-754b-4889-9b25-11c6b920a725/gre_sending_scores_on_test_day.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b554bb36-2a00-46d7-898f-7179292bc5d3/2010_camaro_lt_rs_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/can_you_share_a_on_fb_messenger.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_off0000dcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC6 5460 bytes
SHA-256: 7a278d71ef7cc10956e59041ddf3af599a9ce6d090766c0d84dc416f6edf43cc
font_01_sfnt_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 10748 bytes
SHA-256: 2ac41ede4e9c654c47120ae1e5d2dc6acdb21a9deb60a22842a59acafd052138

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