Malicious PDF — malware analysis report

Static analysis result for SHA-256 031d2e5f648ac389…

MALICIOUS

PDF

43.8 KB Created: 2020-04-11 22:40:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6d6cbc01009b55c1205c11179301dbb4 SHA-1: 343cc9c2a68fbd4d748aa10db7a73553d1f5e9c7 SHA-256: 031d2e5f648ac389073e47d9ddfddf36c1e2b6627c693f524475e18bd7ac095f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spam campaign. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of numerous external links designed to direct users away from the current document.

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://internalalignment.net/uploads/1/3/0/8/130813320/130813320.html#que+es+un+compresor+de+audio
    • http://movingmindsdance.com/uploads/1/3/0/4/130476043/3297886.pdf
    • http://villamelpomeni.com/uploads/1/3/0/2/130272571/2f64a89a.pdf
    • http://pmcacademiccoachingmentoring.com/uploads/1/3/0/7/130740222/7d82c577.pdf
    • http://cyberedgeonline.com/uploads/1/3/0/5/130588653/1246886.pdf
    • http://moonlightmods.com/uploads/1/3/0/6/130640178/kewovupagane-tajamex-jeboso-jixaril.pdf
    • http://ipnetworkflorida.net/uploads/1/3/1/4/131484090/bemataroxufozasud.pdf
    • http://burntofferingsbbq.com/uploads/1/3/0/5/130588679/kazulefuguwo-sasawiwapenato-warimevajoriw-pipax.pdf
    • http://citypulsemy.com/uploads/1/3/1/4/131437626/658718.pdf
    • http://novusss.com/uploads/1/3/0/2/130289460/e0e4cd482.pdf
    • http://rozuki.net/uploads/1/3/1/4/131406253/c4e0d52f31baec4.pdf
    • http://releafhemp19.com/uploads/1/3/0/4/130475982/gagixomomigama-foruweruregi-rurug.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_off000083b8.bin
b3dc346dca09d1823a174c68bcc305ded5ed47c9988bc745dbd45567c2a8ed5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83B8 8220 bytes

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