Malicious PDF — malware analysis report

Static analysis result for SHA-256 6803007457fe15eb…

MALICIOUS

PDF

77.9 KB Created: 2021-10-19 23:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 400f2ccf57502ff370ff5c2ae245102d SHA-1: 11837ab2b4e641907771fec10e98c9b2fd1f6925 SHA-256: 6803007457fe15ebd1e4f1a19ca90f9c6d5cdc6c054a4efff90de858964e6dc6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF sample was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The presence of numerous embedded URLs, many pointing to suspicious domains, suggests a phishing or credential harvesting campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the use of a link farm on disposable hosting, reinforcing the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://casaperugia.fr/userfiles/file/laruvozerewiwederamano.pdf In PDF document text
    • https://muratay.nl/userfiles/file/93865379037.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/76843024893.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/96568177371.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/533975866.pdfIn PDF document text
    • http://foxdigi.com/userfiles/file/44196587351.pdfIn PDF document text
    • http://thepvunamduong.com/media/ftp/file/67391293217.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161486c1adfd71---14440894636.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/31708966405.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/54696846274.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/diripubupakaxivonor.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/78926996259.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/88154276386.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/33805523293.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/xezevabo.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/pelukemukero.pdfIn PDF document text
    • http://wami.cc/data/files/rewedugowuveboxipemid.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/12148853211.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/murenuderewawajunidam.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/87226166703.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/samopekaxuked.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/utqfbv73ut8bf3946r79sb6b65/gudugiba.pdfIn PDF document text
    • https://esz.jp/img/editor/files/pumakefogem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/RhDyTiV0TgQ/uplcv?utm_term=vw+golf+mk1+service+manual+pdfPDF link annotation
    • 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_off0000c8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CB 17960 bytes
SHA-256: 9fb67223c7f4e33c4cd3647fc4e41c364ae52171cd6ac59549e0b77c0e5412fb
font_01_sfnt_off0000f73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 11232 bytes
SHA-256: ca85181f9aaca2a5b48e69c28400c28b981e4e4011e3be46faf892cda33c890f
font_02_sfnt_off00011174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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