Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bdbffa778bf8d3a…

MALICIOUS

PDF

35.2 KB Created: 2020-06-08 00:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f23a54b41866e943955149bd714d5f53 SHA-1: 609665f059fe9076c3a0ed58899dad8c92041fa7 SHA-256: 1bdbffa778bf8d3a3db051c718349dfea668b6eb52023832e2fdf2d4e394f724
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains text related to exercises and statistics, suggesting a lure. The primary purpose appears to be directing users to a link farm of other PDF documents hosted on various domains, likely for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://mtnmaps.com/uploads/1/3/0/6/130604826/130604826.html#exercices+corrig%25C3%25A9s+statistiques+seco
    • http://clucktruckportland.com/uploads/1/3/1/4/131437978/ac09c49.pdf
    • http://host141.coedsportswear.com/uploads/1/3/1/4/131483592/salip.pdf
    • http://sydneydenise.net/uploads/1/3/1/3/131384412/7dbc4b.pdf
    • http://hintenbergerplumbing.com/uploads/1/3/0/4/130436033/8c84a489f82d.pdf
    • http://cpanel.onecoopedchick.com/uploads/1/3/0/7/130739362/dasonuma_pubemigolu_tukugav_nerumoninev.pdf
    • http://m.buildingspecscorp.com/uploads/1/3/1/8/131872225/zalir_gokaja.pdf
    • http://bashfitness.com.au/uploads/1/3/0/8/130874496/jelavevijozoxor.pdf
    • http://autoaccidentlawyerswtl.com/uploads/1/3/0/6/130622077/6568137.pdf
    • http://davidsgregory.com/uploads/1/3/0/6/130604205/9394626.pdf
    • http://osprecycle.com/uploads/1/3/0/6/130621276/lubesupajemapudulag.pdf
    • http://mbtherapygroup.com/uploads/1/3/0/3/130379141/gevafifozo.pdf
    • http://shreveportpoolcleaners.com/uploads/1/3/0/6/130639535/51935c5f6e4.pdf
    • https://gubibegal.files.wordpress.com/2020/06/17415917748.pdf
    • https://zizuxufu.files.wordpress.com/2020/06/wepozijeveludoworuxab.pdf
    • https://towuferenin.files.wordpress.com/2020/06/jawimoje.pdf
    • https://kavotufez.files.wordpress.com/2020/06/26385304417.pdf
    • https://bivaguko.files.wordpress.com/2020/06/mibigejumozarujeb.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_off000056ec.bin
7709f4375d6bdd7c5a27d7da6cf1ac9b73664fc3db0315b8487242d369afcc47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56EC 12748 bytes

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