Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac29758cd9d98a7…

MALICIOUS

PDF

51.6 KB Created: 2020-03-29 11:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dce5f23db2cc71318cf6bb8fb7897b56 SHA-1: a6fcae3491a9a6cea53b2731e4258890e794fbbb SHA-256: 6ac29758cd9d98a71b11c80d4122c24fc77faa9b3d846261a1435a55d935ba2a
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links to external websites, a technique often used for SEO link farming or to direct users to malicious content. The document body, though partially corrupted, contains a title related to cell biology and includes several of these URLs, suggesting a lure to external resources. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

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://thehappygirlstore.com/uploads/1/3/0/9/130969407/130969407.html#semejanzas+entre+celulas+eucariotas+autotrofas+y+heterotrofas
    • http://proswimmingblue.com/uploads/1/3/0/6/130603936/xarugovuti.pdf
    • http://williamfriel.com/uploads/1/3/0/4/130494389/deperu.pdf
    • http://oregonstudents.org/uploads/1/3/1/4/131413222/sutabu.pdf
    • http://whatsyourbloodpressure.com/uploads/1/3/1/1/131163623/8fb89dbd2e5951.pdf
    • http://ideal-product-reviews.com/uploads/1/3/0/6/130640042/xikuzal.pdf
    • http://mibest.se/uploads/1/3/0/4/130483697/pexenotaxavup_xiwadatibexedi.pdf
    • http://86hcky.com/uploads/1/3/0/5/130551126/591296e80.pdf
    • http://archaeologicallithics.com/uploads/1/3/0/8/130873730/bobevo_gezulinumo.pdf
    • http://110t.net/uploads/1/3/0/7/130776737/296234.pdf
    • http://dianayahyapiano.com/uploads/1/3/0/7/130738628/0ca3089317ba.pdf
    • http://metzmtaloysius.com/uploads/1/3/0/2/130288720/14b7c7041b83.pdf
    • http://oldtimerandvintage.com/uploads/1/3/0/7/130738778/fekobuba.pdf
    • http://unicornsandwe.com/uploads/1/3/0/8/130874143/zefebazikorule.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000087fc.bin
3a5200ef945d86fe05710056a866128b1a64e4d71a13f94ffb3dcce6c46ac5c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87FC 9352 bytes
font_01_sfnt_off0000a8f4.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8F4 16204 bytes

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