Malicious PDF — malware analysis report

Static analysis result for SHA-256 7509531c3033eac0…

MALICIOUS

PDF

36.6 KB Created: 2020-04-11 23:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1bb2ad0b6822902d93ee87f40045fd02 SHA-1: 2d3b80eaa572e83e1ef54e54b4e27586b366b30a SHA-256: 7509531c3033eac0bb0ed92452cee1e0da82665a20067ffcd067a1adf4c7cae4
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to other PDF files hosted on unrelated domains, suggesting a link farm or SEO spam operation. The document body mentions a 'Hamilton beach 18 quart roasting oven manual', which appears to be a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports its suspicious nature.

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://mychinesewatch.com/uploads/1/3/1/4/131453465/131453465.html#hamilton+beach+18+quart+roasting+oven+manual
    • http://cabopartyrentals.com/uploads/1/3/0/6/130605403/jigutarav.pdf
    • http://pinkthecat.com/uploads/1/3/0/6/130639682/3f415e7e5.pdf
    • http://zainabphotography.com/uploads/1/3/1/4/131407572/8621894.pdf
    • http://charlesnenneker.com/uploads/1/3/1/4/131454272/sizunimi-mizififobopene.pdf
    • http://selectivewindowsdoorsinc.com/uploads/1/3/0/5/130550888/bovodaperidedofexif.pdf
    • http://hiphopsdamagecontrol.com/uploads/1/3/0/6/130604702/4378872.pdf
    • http://northerntravelandevents.com/uploads/1/3/1/6/131636702/0b971.pdf
    • http://omgfashionsjewelry.com/uploads/1/3/1/4/131453603/5447493.pdf
    • http://cabothead.com/uploads/1/3/1/4/131407734/negufom-gexute-fudikowu-nekejodosileza.pdf
    • http://topclasscreative.com/uploads/1/3/1/3/131380404/xaruniditabajifek.pdf
    • http://peak-life-wellness.com/uploads/1/3/0/5/130539678/5165939.pdf
    • http://ceresnutrition.net/uploads/1/3/1/4/131407655/8343430.pdf
    • http://vpdgov.com/uploads/1/3/1/4/131452953/61654f4838.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_off0000660a.bin
d28d3216c1f089d4d7431c73206d559082d8a2655376610e13feec4008b6a97b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x660A 8356 bytes

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