Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac7059f7cb542f9…

MALICIOUS

PDF

40.9 KB Created: 2020-04-01 15:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 22126e3ffca86b23aef49ac438f73044 SHA-1: 04dab77fc92ebfbbb74ab8ce84619328ceb6b8f2 SHA-256: 2ac7059f7cb542f9552526d6a29c4a19095359dfa7dd6543437a939253325027
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files on various domains, indicating a link farm or SEO poisoning tactic. The document body, though partially corrupted, contains text related to children's science experiments and the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous unknown-reputation URLs reinforces the malicious nature of the file.

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://sustainableresourceuide.com/uploads/1/3/0/5/130551049/130551049.html#experimentos+faciles+para+ni%C3%B1os+el+globo+que+se+infla+solo
    • http://canllonga.es/uploads/1/3/0/3/130323957/0a94734.pdf
    • http://lejardinviolet.com/uploads/1/3/0/5/130589449/5179859.pdf
    • http://nadlanonline.net/uploads/1/3/0/5/130539849/lameti_seborekad_dopopefoke.pdf
    • http://theromanticduo.com/uploads/1/3/1/0/131069997/7abb5fca.pdf
    • http://mta-sts.mx.practicalteacherresearch.com/uploads/1/3/0/3/130323485/jetaxemosodejo_dewojeguzux.pdf
    • http://ligatiosjunk.com/uploads/1/3/0/7/130775590/dikasifes.pdf
    • http://villagemomentum.com/uploads/1/3/0/7/130775570/bunamad.pdf
    • http://tntgeneralservices.net/uploads/1/3/0/6/130620624/ribodaga.pdf
    • http://mia-and-darrell.com/uploads/1/3/0/8/130874409/7620fb7203e4be.pdf
    • http://uncomplicatedmeditation.org/uploads/1/3/0/2/130287937/8844265.pdf
    • http://walmsworld.com/uploads/1/3/0/6/130604543/3193229.pdf
    • http://thetinycontainerhome.com/uploads/1/3/0/2/130291536/semezarorixik_tewomud.pdf
    • http://ianrichardsonfoundation.com/uploads/1/3/1/3/131380720/fuwarulisoxevod_suxufoxiwibik_zememosuluxodi_vugeregiteranex.pdf
    • http://oasabconsult.com/uploads/1/3/0/5/130543106/figuzu.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_off00006932.bin
87d313fd841cc2da154c0ce33ac9338bffa79ac09eff0fd7c76b10fe75fc150c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6932 8904 bytes
font_01_sfnt_off00008972.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8972 2652 bytes

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