Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3103ed5d36fa681…

MALICIOUS

PDF

38.6 KB Created: 2020-03-23 02:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 25b31b0777670860527efc4bc1397ba6 SHA-1: 0a3e9a700bb8616a061810c1a3731d544bf25f4e SHA-256: a3103ed5d36fa6818d099063bfa8c0a4f0315e113f4eb4f66f43471830a731b1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many with numeric or generic slugs, indicative of an SEO link farm or spam campaign. The document body itself contains a URL that appears to be a lure, directing users to a page with a seemingly innocuous title but likely leading to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a 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://tridentbeachvolleyball.com/uploads/1/3/0/4/130483616/130483616.html#que+significa+organigrama+en+salud
    • http://www.janeturner.org.uk/uploads/1/3/0/8/130813770/fasuluk_gelojifujet_rolaberib.pdf
    • http://businessfurniturecleaning.com/uploads/1/3/0/6/130639983/fimigetus.pdf
    • http://excelscaffoldhire.com/uploads/1/3/0/7/130740590/safoseb.pdf
    • http://chirpsofftheoldblock.com/uploads/1/3/0/7/130776617/juregepinefison-vewegelevipe-fedobubine-wutavalezitu.pdf
    • http://alcohol-freepregnancymn.com/uploads/1/3/0/6/130621161/9137312.pdf
    • http://www.protective-armour.com/uploads/1/3/0/6/130604807/5316dbe9bca9.pdf
    • http://capellandecampo.com/uploads/1/3/0/6/130604290/94ee70b.pdf
    • http://theswingplane.com/uploads/1/3/0/3/130312964/788ea4.pdf
    • http://voyageaustralie.info/uploads/1/3/0/6/130621276/teximupe.pdf
    • http://crapcocktailclub.com/uploads/1/3/0/6/130639978/61f53c1.pdf
    • http://incentivetravel4u.com/uploads/1/3/0/6/130620525/nolaxojefaxofi.pdf
    • http://rustic-farmhouse.com/uploads/1/3/0/7/130775358/sefabu.pdf
    • http://www.borntomassage.nyc/uploads/1/3/0/6/130604175/1271007.pdf
    • http://joyceandcraig.com/uploads/1/3/0/5/130539033/61479caece3f9.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e90.bin
ea6a909e61bac9ac720c037f00e66e924adbb29a70caea9477c9276cbfd719a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E90 8580 bytes

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