Malicious PDF — malware analysis report

Static analysis result for SHA-256 1918a5d3fba505c8…

MALICIOUS

PDF

93.9 KB Created: 2020-03-29 12:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 107a05e5415d07dda1c7dee040cb86ec SHA-1: df42d8a79cd49569995520b15edda9140b6a0166 SHA-256: 1918a5d3fba505c8806e34f172f775ea77caa8a85577c7163de95a7db9d24c98
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The document body is heavily obfuscated but contains a URL that appears to be part of this scheme. The ML classifier strongly indicates maliciousness. The primary attack pattern involves leveraging SEO techniques to distribute malicious content or redirect users to harmful sites.

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://shopbelfast.info/uploads/1/3/0/7/130775052/130775052.html#daily+bible+reading+plan+pdf+2019
    • http://votemichelledeatrick.com/uploads/1/3/0/5/130588457/f8cdfda8050861.pdf
    • http://adamdaltonblake.com/uploads/1/3/0/5/130544591/4206742.pdf
    • http://petersonmicrofarm.com/uploads/1/3/0/5/130543816/vepobamil-rexotigopufifu-xijudugejazem.pdf
    • http://australianchartsreport.com/uploads/1/3/0/6/130639344/wodadazupoda.pdf
    • http://project-candle.com/uploads/1/3/1/0/131070750/8913939.pdf
    • http://mrbeavercreek.com/uploads/1/3/0/6/130640200/afbc009.pdf
    • http://graycopro.com/uploads/1/3/0/7/130740003/pukib_vazekigipafa_dules_nikez.pdf
    • http://divinedwelling.org/uploads/1/3/0/8/130874372/padofujidol.pdf
    • http://cargo6.com/uploads/1/3/0/5/130539908/pudokitasowidoj-gitukolakuv.pdf
    • http://aalcjournal.com/uploads/1/3/1/4/131411197/e85bb.pdf
    • http://bethelliottlmft.com/uploads/1/3/0/5/130539244/535079b46a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d33.bin
9a32a4352728fa4f51206cb0f9c25e08e09e4a84250510b81a5c9a8508422beb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D33 9932 bytes
font_01_sfnt_off00015117.bin
95bcf96bf125171968f88ec26039a5c5c87dc43a688d82aa9a1b2f1dfccd5706		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15117 16696 bytes

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