Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3bcf2b41e5019d…

MALICIOUS

PDF

41.5 KB Created: 2020-04-09 05:39:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 58fb2c06daa8e4bf0ae9119e09c1e53f SHA-1: 2f7d365b3739882267e7a9fabd9922138a3ba904 SHA-256: 0f3bcf2b41e5019df9494f76be2cca8d8646b9887e4255fd04902ddf9d6a9c76
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links to external websites, a common tactic for SEO link farms or phishing campaigns. The document body is obfuscated but contains a URL that appears to be the primary lure. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to host or redirect to malicious content.

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://lipstickcellphonepurse.com/uploads/1/3/0/7/130775982/130775982.html#word+equation+for+combustion+of+octane
    • http://integrativefamilytherapy.com/uploads/1/3/0/5/130550980/44e2910.pdf
    • http://memoryfoamdogbedliner.com/uploads/1/3/0/6/130639162/6c16c15762a233.pdf
    • http://plugintochange.com/uploads/1/3/0/3/130323222/sotonedobedibu.pdf
    • http://mysticbootye.org/uploads/1/3/0/4/130483417/kugavusamoxubiko.pdf
    • http://amandaferg.com/uploads/1/3/1/3/131379375/fepugupuzo.pdf
    • http://marthanorman.com/uploads/1/3/0/5/130589312/7648157.pdf
    • http://overandabovehomeinspections.com/uploads/1/3/0/6/130605292/9532410.pdf
    • http://artfunforeveryone.com/uploads/1/3/0/3/130323547/falibuv.pdf
    • http://verifiedswitchboards.com/uploads/1/3/0/7/130738572/bepuvodatejini.pdf
    • http://rcbshopping.com/uploads/1/3/1/4/131437766/d00c9f5.pdf
    • https://s.\r\rC8H18
    • 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_off00007888.bin
abc15304a9b50ccd46848ad54ff9eb799ca5712e44dc42b953fc0127ee3feab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7888 8624 bytes

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