Malicious PDF — malware analysis report

Static analysis result for SHA-256 b887702ade6b6d7e…

MALICIOUS

PDF

105.6 KB Created: 2020-12-16 01:38:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21aa28120ecb35768565b2b7695cb99a SHA-1: 135ca1ee899aab823cee0f4a72dbc58ae8ca9086 SHA-256: b887702ade6b6d7e70394ad4da3cf92b4d25d07cddd0d26a10c321920ad73787
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the PDF structure suggest an attempt to redirect users to malicious sites, potentially for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/aws?utm_term=banach+tarski+paradox+pdf
    • https://lumozilupive.weebly.com/uploads/1/3/4/3/134336046/c82ef3.pdf
    • https://kuribigewisowe.weebly.com/uploads/1/3/4/6/134688213/282935eb.pdf
    • https://cdn-cms.f-static.net/uploads/4382972/normal_5f9cf7b07d61f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wupiwupiwot/cleveland_police_report_center.pdf
    • https://static1.squarespace.com/static/5fc3978f60f2895dc1f8b122/t/5fd08c1f6cbf29106bff2c0c/1607502880187/lock_screen_live_wallpaper_android.pdf
    • https://static1.squarespace.com/static/5fc124bf3dfdd95b60d690c4/t/5fc677a518e72e5fdbb72b0d/1606842278465/gravity_falls_mabel_and_dipper.pdf
    • https://static1.squarespace.com/static/5fc6684c116eb00e3c71b053/t/5fd17815ebc7ce75e8a8265a/1607563287379/smartness_definition_in_bengali.pdf
    • https://uploads.strikinglycdn.com/files/05910146-375a-49a3-84c1-1db9a5991e0a/game_architecture_and_design_breda.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5a97fa04221c711795e5/1606376088454/goromivelebajefe.pdf
    • https://uploads.strikinglycdn.com/files/23e37112-41f2-459e-b7fa-fbc49867c362/3867339191.pdf
    • https://uploads.strikinglycdn.com/files/70a49a22-9d60-4e76-a98d-bf3fa78019d2/boretunikudigubefolib.pdf
    • https://uploads.strikinglycdn.com/files/85a70b7d-8e22-4752-b8e4-7a74b421c2dd/35136229972.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013412.bin
604e1f9be8a3b46b0ba056f8870e3839977c4da5bc4cb8267e8ac5d793d51260		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13412 5060 bytes
font_01_sfnt_off0001452d.bin
f2c62d224e8ec27d77eed5dfdee923863f39e39560a5969b8ec5a6d58984e9b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1452D 13932 bytes
font_02_sfnt_off0001732e.bin
68e406f951115009404cf88c2e39c7004b8b7810e9dc3c929e1830beff540ac0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1732E 16760 bytes
font_03_sfnt_off00018ad2.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18AD2 4324 bytes

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