Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38922aa2ac7797e…

MALICIOUS

PDF

71.8 KB Created: 2021-02-06 08:58:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 040cdb04d7a90a27fffa73181b0fb864 SHA-1: b5fb130c1fcf4d59e81b3b49f95940dcc3fb7296 SHA-256: a38922aa2ac7797e6136198b6c831ef7feb6c85b22e9f80c1524cf35996c9a7d
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://maypoin.ru/aws?utm_term=bayu+bayushki+bayu+sheet+music PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4443372/normal_5ff3d51b8978b.pdfIn PDF document text
    • https://bibomezu.weebly.com/uploads/1/3/2/7/132710601/zuked_wapowewerakokex_debobomalivipew_kegonugax.pdfIn PDF document text
    • http://axecheat1.xyz/green_technology_in_civil_engineeringrwvyy.pdfIn PDF document text
    • https://nojasiputijaze.weebly.com/uploads/1/3/4/8/134869787/disakoxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366325/normal_6003b6dcdedfb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459631/normal_5fc79d6be9319.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471513/normal_5ff669af2511c.pdfIn PDF document text
    • https://cdn.sqhk.co/mifimafonuku/hebUjdQ/58508508831.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413345/normal_5fcf84ebf352d.pdfIn PDF document text
    • https://zikixitifo.weebly.com/uploads/1/3/4/8/134897390/555142.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/nupotukig/75166998277.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/vafikesojil.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/17._1_equation_of_a_circle_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/jepoxudoxupewepe.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/zosixebi.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/mupupipafixobate.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/keystone_snow_report_hours.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/niwibex.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_off0000dcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAD 5268 bytes
SHA-256: d15fb0ba142820abe6a7e90dfce149d6a6007425a14d008c1852b2d1cbe0d170
font_01_sfnt_off0000ee7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 10488 bytes
SHA-256: e6af034bdc888711eb6b0705dff878ca8b1a6f4f6ede58e32ffa11b8042577eb

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