Malicious PDF — malware analysis report

Static analysis result for SHA-256 970a3fc241c66d19…

MALICIOUS

PDF

84.8 KB Created: 2021-09-14 18:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 464c43c1586a824a81875fc15aad7e92 SHA-1: 7ae0ffdb1e114e4b2f4de0b1334b969c30e10d52 SHA-256: 970a3fc241c66d19a6f16b8d3dd3b31555f2d548e872da2a454ab200ef8022f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded content indicate it's intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nomylo.ru/uplcv?utm_term=hercule+poirot%27s+christmas+pdf PDF link annotation
    • http://oshcongregation.com/userfiles/file/63907967377.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/1172034027.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/rilokusowaxe.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630806876.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/xubuk.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/74423458291.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/97581159837.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/rabapewe.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/36361467208.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f187c50fca---91612263710.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/jufugikejaderikotiworugo.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/wufodep.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac85681c2c---vasasudomebawobipigud.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/wobowivininitilag.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/luzeka.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/95944865578.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/63202831539.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/katinewoxigijux.pdfIn PDF document text
    • http://quetthe.com/upload/files/tedokejarifevasaf.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/65130510314.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/87348889945.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F3 19096 bytes
SHA-256: 8071330638bae67fb3a6fbfab2d187d1bb1ade7dc784b81f4a1522c3cd9164b7
font_01_sfnt_off0001140e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140E 10904 bytes
SHA-256: 4a497bf5d26b9e4de1810a4710bfee6b3f31e6614fcfead9bc15a6dd151620c1
font_02_sfnt_off00012d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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