Malicious PDF — malware analysis report

Static analysis result for SHA-256 709256b164c6a449…

MALICIOUS

PDF

89.8 KB Created: 2021-02-14 17:19:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8b04a181a0820d6f3feaebb5b334056b SHA-1: 7c436339be50bc61b5a4677141920b4b3e010a5d SHA-256: 709256b164c6a4490c32bb9252b0dc1b265e960b959c3520219829be36543c09
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and is flagged by ClamAV as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious content, masquerading as educational resources. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/wb?keyword=grade%2011%20mathematics%20textbook%20pdf%20ethiopia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427273/normal_600b1b4b7bee6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468554/normal_60179c67bc878.pdfIn PDF document text
    • https://cdn.sqhk.co/govuzupikiwe/Djjjc8R/spiral_jetty_artist.pdfIn PDF document text
    • https://lapamijivosesez.weebly.com/uploads/1/3/4/5/134507295/6292356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479917/normal_601dc101bdbbf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495265/normal_6006e3d5bce7e.pdfIn PDF document text
    • https://cdn.sqhk.co/bimeniwog/gjgjdeW/nail_biting_polish_toddler.pdfIn PDF document text
    • https://temizugejifo.weebly.com/uploads/1/3/1/3/131384470/divawof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454179/normal_5fd26a603c2d3.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/ifXORha/subukowewesovuxid.pdfIn PDF document text
    • https://cdn.sqhk.co/verikiweneza/igdibib/mejurizuvebatewovufunikof.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/haYsyIG/honda_gx200_engine_price.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405674/normal_6003ca2cacce3.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/fosalizuzu/60158611747.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/petotemiwawotuxabebam.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/best_app_to_instagram_videos_iphone.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_off00011ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA1 5716 bytes
SHA-256: 5fcd4afee49f172e219abbf673b60225d7054edaab2ff0a0f858a4b4816b73ec
font_01_sfnt_off000131f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F0 11140 bytes
SHA-256: 584b70511953cc0dc0afea48b6237b40918e807fef6c6132daac6d33594699c7

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