Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b357f615a8828c…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 15:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ed5f61ad9051fa0e0f7b4f70a4a08b9b SHA-1: 6455ec3cd53bdba3f2a59a0f6c29b26c6cbdd2f7 SHA-256: d3b357f615a8828c9c60f15459d523eb371aacb636c8a7aa198a54c112d7c5d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm. The presence of a disposable hosting link farm heuristic further supports the malicious intent, suggesting the PDF is used to redirect users to potentially harmful content or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--z92bzy85x.com/userData/board/file/27181387672.pdf In PDF document text
    • http://kompassztuki.pl/Image/files/98065412004.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/65022828417.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d20770afbb---59282660521.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/giferanelimumojovuzutoduz.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631878402_58937734d4.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/21849934198.pdfIn PDF document text
    • http://checopharma.com/upload/files/21592587080.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/sokakax.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/19993776596.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rezigabedur.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/zitezesuretexowagori.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/xivewotuzutatezufib.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/pafazosuxisuragobabipoxi.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109112003485338.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613125848bc43---sulukajidepevozam.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/40931138174.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/bezidobozibaxed.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/20826256832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=system+explorer+androidPDF 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_off0000d4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDC 17792 bytes
SHA-256: c542e947e72a040f0763cae5b1aecffb345588568151b7430f2153291706d2e5
font_02_sfnt_off00011b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B25 10844 bytes
SHA-256: 063dbc0fdad2c9d6591630f47ecc9b9ecd3e6ad2a8f0b7b7d8b3425e40142dd1

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