Malicious PDF — malware analysis report

Static analysis result for SHA-256 73eb8b8f7aaf3d34…

MALICIOUS

PDF

34.5 KB Created: 2020-06-14 03:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 01b2e8d047a3217eeb5f925b66fe2ca7 SHA-1: a85bb0f9711a895ec994ca9ce5fa892d87131826 SHA-256: 73eb8b8f7aaf3d34db9d52db1e23d2c41f9b5c4951cce5c06460d74e50bf6b9e
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. While no scripts were explicitly extracted, the embedded URLs are the primary indicators of malicious intent, likely serving as lures or downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 http://dnborders.com/uploads/1/3/1/4/131409009/131409009.html#lfs+harita+yamas%25C4%25B1 PDF link annotation
    • http://squatchlandapparel.com/uploads/1/3/1/4/131437101/3333464.pdfIn PDF document text
    • http://hostmaster.permanentmakeup-schaefer.de/uploads/1/3/0/3/130323337/neliruwupitufep-nekak-sefok.pdfIn PDF document text
    • http://eightarrows.net/uploads/1/3/1/6/131636891/30ff0a.pdfIn PDF document text
    • http://mailserver.margarethigginson.com/uploads/1/3/1/8/131871864/telikuwoburodir.pdfIn PDF document text
    • http://freshmomacademy.com/uploads/1/3/0/4/130488847/fituwuronizan-putoxipasubu-lutakino.pdfIn PDF document text
    • http://dominguesandkane.com/uploads/1/3/1/0/131070895/xopipijabibamevasu.pdfIn PDF document text
    • http://makerplacelivework.com/uploads/1/3/0/4/130488067/rodovomud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ruzulujaso535019409.files.wordpress.com/2020/06/33829266565.pdfIn PDF document text
    • https://xodomibat.files.wordpress.com/2020/06/78377953296.pdfIn PDF document text
    • https://janavitim807994190.files.wordpress.com/2020/06/79407592933.pdfIn PDF document text
    • https://namilarom.files.wordpress.com/2020/06/34322853360.pdfIn PDF document text
    • https://jokodonekoz.files.wordpress.com/2020/06/47323844081.pdfIn PDF document text
    • https://tigizenawa.files.wordpress.com/2020/06/50142192625.pdfIn PDF document text
    • https://wegogewajiki.files.wordpress.com/2020/06/30028335595.pdfIn PDF document text
    • https://majepako.files.wordpress.com/2020/06/39177063269.pdfIn PDF document text
    • https://kumuderaxumi.files.wordpress.com/2020/06/gasipoxosig.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

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5029 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_01_sfnt_off000058b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58B5 11416 bytes
SHA-256: 4b934f45d38866a14f1a3e47ff66f1ec686aff2dc9eaaa298f91428ade728a01

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