Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe9098bc22d5a22…

MALICIOUS

PDF

44.2 KB Created: 2020-03-25 11:06:57 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-07
MD5: 0e8155e28dc501515b477fad5e211c6a SHA-1: 860334201c2c66d660719b9e5d9814bd38f30a5d SHA-256: dbe9098bc22d5a2238cbf5fca2854308acc9f16996321d80710a2b9d80251fb5
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine rankings for malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded links.

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://loomispumpkinpatch.com/uploads/1/3/0/7/130740547/130740547.html#toto+wall+mount+toilet+with+washlet
    • http://thejohnv.studio/uploads/1/3/0/7/130775232/760b9f1eddd45.pdf
    • http://theglassworkspace.com/uploads/1/3/0/6/130639344/6e876.pdf
    • http://everythingcpap.net/uploads/1/3/0/6/130639141/28338df.pdf
    • http://www.archesbrewinggallery.com/uploads/1/3/0/6/130621366/615e1c04e35d.pdf
    • http://omdadelivery.com/uploads/1/3/0/2/130291471/bavudar.pdf
    • http://prouni2022.com/uploads/1/3/0/7/130738576/a7ffe69cc8.pdf
    • http://castleshomedecor.com/uploads/1/3/0/8/130873939/2236344.pdf
    • http://cchsscience.org/uploads/1/3/0/5/130543798/7abe4a15cd2c268.pdf
    • http://commeunbloc.com/uploads/1/3/0/6/130639037/7936652.pdf
    • http://decarofineart.com/uploads/1/3/0/6/130603955/d9659ef2.pdf
    • http://neuemusikschuleberlin.com/uploads/1/3/0/7/130775173/notogabiwuke-sasimozor.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_off000082ca.bin
d5f2fd6d92ebb7c19a3bdf8f6f3a1118d64e10cb48c6617586ad43ed616da847		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82CA 8728 bytes

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