Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d4f2c4fa492931…

MALICIOUS

PDF

95.1 KB Created: 2021-02-13 17:44:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a5520074902e696381ee0e00381f6735 SHA-1: 401e9f06711411fbf4084cbbb543a7956d228272 SHA-256: 91d4f2c4fa4929317b5170470bb83ca44216e6909dbdc72f718b9e5a2bd63c58
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to potentially malicious domains, indicating a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

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://seumenha.ru/wix?keyword=never+fear+cancer+again+how+to+prevent+and+reverse+cancer+pdf PDF link annotation
    • http://tigexesuni.22web.org/lupowazafasidizigorex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410956/normal_6001eec22f842.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/4194662.pdfIn PDF document text
    • http://fupodiruza.66ghz.com/siesta_key_tide_report.pdfIn PDF document text
    • https://vobudogekatobef.weebly.com/uploads/1/3/0/8/130874620/wuxudinopolow-tugazelalibo-vugezagupaxo-ropom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493550/normal_601d4e31b9d2c.pdfIn PDF document text
    • http://tesar-krd.ru/grepolis_report_toolslufnk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480876/normal_601401d94d455.pdfIn PDF document text
    • http://presentinsta.online/honkai_impact_3_mod_apk_2.5_0blebt.pdfIn PDF document text
    • https://selijejexo.weebly.com/uploads/1/3/0/9/130969160/2558865.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/computer_science_principlesz8ftc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386079/normal_5fef11e1cbe3e.pdfIn PDF document text
    • https://zaxizibu.weebly.com/uploads/1/3/4/6/134672664/puwok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379844/normal_5ff622318ff38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411935/normal_5fd9584b63cab.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/gazivemon/alcatraz_prison_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/report_potential_identity_theft_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/kozewixekegogexusadopol.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/indesign_portfolio_template_a3.pdfIn PDF document text
    • http://ladesefutajon.rf.gd/bcma_at_ryan_uniform.pdfIn PDF document text
    • http://nikuzemadol.rf.gd/word_letterhead_template_different_second_page.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_off00013662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13662 5504 bytes
SHA-256: 870c9780152978545aa108c5c585aeb4cef3cf90549a18af61b16e7db19eee3a
font_01_sfnt_off00014938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14938 10824 bytes
SHA-256: 703b5b31f37932f53a55252be2829e50488f40b7ec0c440fd536555c23fc5e7c

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