Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a89b3dedb7d39c5…

MALICIOUS

PDF

31.1 KB Created: 2020-05-18 04:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f88f593f371e572bcf413130a02ea5db SHA-1: 2c52ee0f8f61930552484c364efb8f45d23a9d34 SHA-256: 8a89b3dedb7d39c53d5093d63e2f13ad781214da382ff1fec5bba4f8b4f902de
94 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, directing users to a large number of external PDF documents hosted across various domains. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm. The embedded URLs are likely part of a scheme to distribute further malicious content or engage in SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://stratford-hvac.com/uploads/1/3/0/2/130270873/130270873.html#gunmetal+steel+sheet
    • http://icygaze.com/uploads/1/3/0/6/130640070/kinibux_gopopopovemaj_gisepuxanaru.pdf
    • http://storybrooksentertainment.com/uploads/1/3/1/3/131381891/numawabekabug_vokifagumax.pdf
    • http://vitalitymedicalinfusion.com/uploads/1/3/1/6/131606473/vupapifolaw-raferad-xudirafuropov-fazaputosose.pdf
    • http://drkrys.com/uploads/1/3/0/8/130873947/vadololokazag.pdf
    • http://maxvenus.com/uploads/1/3/0/6/130622116/b59228f03780d07.pdf
    • http://thomaserandall.ca/uploads/1/3/0/5/130589040/5468584.pdf
    • http://sjaysphotography.com/uploads/1/3/0/8/130813320/5aca6cc02eaf.pdf
    • http://emcrii.com/uploads/1/3/0/7/130739661/d168cb.pdf
    • http://menzelcoaching.com/uploads/1/3/1/8/131871466/fonedejevogus.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_off00005149.bin
1dc0b3be89f572936034cae42289cc3489b03c17120864e649b227910258ef4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5149 9512 bytes

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