Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8a912b747ee1e6…

MALICIOUS

PDF

70.2 KB Created: 2021-03-01 06:49:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: f8f93f61c61055f3bfac4e8a95d5b15f SHA-1: a728254d2ca234351effbebc3afccdc8a69b270c SHA-256: 9c8a912b747ee1e6a9efca4165ee48cb6ff7806c058fb18dc3ea8c56e7e1fa49
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to suspicious domains and are likely part of a link farm for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs suggest the document's primary purpose is to redirect users to malicious websites, potentially for phishing or to download further payloads.

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://jacksth.ru/wix?keyword=governor+wentworth+regional+school+district+jobs PDF link annotation
    • https://mawuredover.weebly.com/uploads/1/3/5/9/135957038/2454175.pdfIn PDF document text
    • https://cdn.sqhk.co/tikikizeveni/gcFjcih/olympic_sports_logo_png.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379733/normal_5fc7368b65af1.pdfIn PDF document text
    • http://fitness-ital.fun/zazofojolo12l4y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475847/normal_6021ac39839ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380211/normal_603bdab985af0.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/fukepez/cc_mu_powerpoint_2010_p.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/10649954012.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/4556331887.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/how_to_be_a_certified_first_aider.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/nababekomoxuzixalakanegi.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_off0000d2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DC 5600 bytes
SHA-256: 9c7aae5927cdc7becef3c34bceacc8a93a3b33d3561b28abfab2e5b1c3613e4b
font_01_sfnt_off0000e5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F9 10592 bytes
SHA-256: 27ac95cf612baa6e8a0bbcc223ea254288392d8c63ec6ef7007e44a5302b5a76