Malicious PDF — malware analysis report

Static analysis result for SHA-256 4884960eb690e105…

MALICIOUS

PDF

46.8 KB Created: 2020-04-04 07:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 186d030e7cb4cc9b063234d453446508 SHA-1: 58bf6350aac305b0bbee1ac67f0fab5555179baf SHA-256: 4884960eb690e105a4d711aa0dd7418eeca4fc5eb7a5936a3fd60ad6aa4be15b
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body contains text related to trigonometry, which appears to be a lure to disguise the link farm. The primary purpose seems to be directing users to a network of websites, potentially for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://carpentercreekfarm.net/uploads/1/3/0/6/130621437/130621437.html#trigonometria+triangulo+retangulo+se
    • http://monicajacobsontennessen.com/uploads/1/3/0/2/130289734/dogizupuravewod.pdf
    • http://mrdombaza.com/uploads/1/3/0/7/130740419/jumoroxeworax-fezilid-fumati-pemofi.pdf
    • http://tune1.net/uploads/1/3/0/3/130323478/bb8c58162fb.pdf
    • http://depilsugar.com/uploads/1/3/0/3/130379959/pupad.pdf
    • http://wellbrookfarms.com/uploads/1/3/1/4/131438265/7486231.pdf
    • http://b-meclub.org/uploads/1/3/0/9/130969198/c676db8d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068fe.bin
28898668d45ebeef123a6c35dce87b7374439d482f6f3bab36540dbec7ac00a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68FE 10124 bytes
font_01_sfnt_off00008b70.bin
ea96a6e0ea22c0654da0ffeaa3478ad23e88b03a0b1de4d647aa2887f8751370		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B70 3360 bytes
font_02_sfnt_off0000972c.bin
65ca2fa633a49bc637c245e3469a24bec82cbb291b9200d770c42ee2df1588ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x972C 16096 bytes

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