Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab501f5743d630b5…

MALICIOUS

PDF

70.4 KB Created: 2021-02-26 22:23:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 1b6ee11cc80a9671c0c42a0ee4c90fc6 SHA-1: 67cb9a002a3ac294b6bd4c529edec929ddd2c08d SHA-256: ab501f5743d630b5f6e23fc4d4d58416d6e0707a93fa12bc16cf62bf01c60a1a
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/award?keyword=end+of+open+range+barbed+wire PDF link annotation
    • http://creditscorehelp.info/actron_autoscanner_plus_how_to_usedq8e7.pdfIn PDF document text
    • https://cdn.sqhk.co/bafesugoguwi/ghgiheT/u_mobile_centre_kuching.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370780/normal_601af66d3c03b.pdfIn PDF document text
    • http://huaweistoreukr.xyz/bujupudk9re2.pdfIn PDF document text
    • https://cdn.sqhk.co/bolomekurufe/R1Z70Qc/nujafugotopap.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/ijaT5ha/coupons_for_walmart_grocery.pdfIn PDF document text
    • https://fuxilidunud.weebly.com/uploads/1/3/5/3/135314653/xegex_kizanefeveb_dabagagozuwiraw_dizabir.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/BG0hlgd/color_chart_hair_wella.pdfIn PDF document text
    • http://tertov.xyz/kreekcraft_ranking_piggy_skins96jdv.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/xakajoziwibi/55698248629.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/fidic_contracts_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/vudupitugemenokobodij.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/karepimejifevobiladewiw.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_off0000d7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C0 5188 bytes
SHA-256: 48db52bb167f5998d04ec9300621328acce4a599237cf51452ae380c212b7a43
font_01_sfnt_off0000e988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE988 10740 bytes
SHA-256: 6b2efac8a4da48452f4f7175ce2a0c92f9f9b707967899806b22f5688cb8156b

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