Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51572cfdeb7e514…

MALICIOUS

PDF

65.3 KB Created: 2021-03-29 07:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c435da57109c18b7b0ef006e1f66a4cb SHA-1: 840e092cdbc47bb4687ca8055edc2d7025073d26 SHA-256: b51572cfdeb7e514eb5e68a04bad18e77b29de26b9eb34a4698a5170591d29a0
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 point to SEO-optimized PDF files, suggesting a link farm or content-spinning operation. One prominent URL, 'https://pelibifir.ru/wix?keyword=weststar+mortgage+loan+servicing+albuquerque+nm', is likely used to lure victims by mimicking search results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/wix?keyword=weststar+mortgage+loan+servicing+albuquerque+nm PDF link annotation
    • https://wigizidipi.weebly.com/uploads/1/3/5/9/135984633/movoriminikegiwifi.pdfIn PDF document text
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/c222de204909.pdfIn PDF document text
    • https://kazanuwe.weebly.com/uploads/1/3/2/6/132683097/xaleroz.pdfIn PDF document text
    • https://sagudazotimoja.weebly.com/uploads/1/3/4/7/134753003/9960776.pdfIn PDF document text
    • https://suzagosezamonu.weebly.com/uploads/1/3/4/4/134446802/fuvozenenamarawekube.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/jhPfBZ0/21809349324.pdfIn PDF document text
    • https://serutoposax.weebly.com/uploads/1/3/5/3/135398922/4b27fd2.pdfIn PDF document text
    • https://gifuroromila.weebly.com/uploads/1/3/4/3/134377961/de9e39.pdfIn PDF document text
    • http://depepuxuri.22web.org/47870482455.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/geibPT7/bewunasewabukulasebokise.pdfIn PDF document text
    • https://rilulozopofebu.weebly.com/uploads/1/3/1/4/131406258/kiborenerogakefepepe.pdfIn PDF document text
    • https://bunupujitoj.weebly.com/uploads/1/3/4/0/134017728/nonunukaraz-soziwinosipe.pdfIn PDF document text
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/guror-wulojolup-tutozus.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/nuxulikiwab/fios_quantum_gateway_router_g1100_red_light.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/remington_electric_pole_chain_saw_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/84084955611.pdfIn PDF document text
    • http://zaxesagujudiwa.epizy.com/construction_site_accident_report_form_template.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/29224340018.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_off0000c432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC432 5460 bytes
SHA-256: bc81312feef0e71141b526742a78de4df95412f36d874b014daa63e669270e5b
font_01_sfnt_off0000d6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BE 9736 bytes
SHA-256: d8cbaf9b2b44cfd17dc61c26c36abfa4326a2683e3a0f435ec4003d11d47c6dd

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