Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7c84de44aca331…

MALICIOUS

PDF

37.0 KB Created: 2020-04-17 06:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e8d3186359514dbbf802570e080a6726 SHA-1: 05811e7439ed4fb5f30f9ff5601aa9eb1de98713 SHA-256: 8f7c84de44aca331c214533f0e28a0c18f492ff8b7e69ac114dd19457017b9e8
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains references to "Clarks formal shoes singapore" and URLs that appear to be part of a link farm strategy. The ML classifier strongly indicates maliciousness. The primary attack pattern involves directing users to a network of external websites, likely for SEO manipulation or to host further malicious content.

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://hyperion-ai.com/uploads/1/3/0/7/130776103/130776103.html#clarks+formal+shoes+singapore
    • http://echolandapartments.com/uploads/1/3/0/8/130874179/8813762.pdf
    • http://muu-clog.com/uploads/1/3/1/0/131071309/mikinowaveneg_jirarudarawax_sasonawo_subimu.pdf
    • http://anthemsmusic.com/uploads/1/3/0/8/130813054/7202795.pdf
    • http://toppicksconsignment.com/uploads/1/3/1/4/131407796/nurisikemeru-ripifuzip.pdf
    • http://rapturegoldmall.com/uploads/1/3/1/3/131380297/6b4daf0730222db.pdf
    • http://christinagdennehy.com/uploads/1/3/0/3/130323693/famuj_kafaji_gefilisela.pdf
    • http://frommylittlecorner.net/uploads/1/3/1/3/131379803/tipodifezawoli-sudavava-vofilubapewem-dutosidi.pdf
    • http://ausaudio.net/uploads/1/3/1/1/131164176/040e4ea0.pdf
    • http://412catawba.com/uploads/1/3/1/4/131438419/6254312.pdf
    • http://mysteryshoppingonlinejob.com/uploads/1/3/0/6/130639312/sikiba_xiramalikenor.pdf
    • http://sunnylucia.com/uploads/1/3/0/6/130621351/mupamirid-kejen-gipazinaf.pdf
    • http://104mtcomfort.com/uploads/1/3/0/6/130639192/lokazamalijuke.pdf
    • http://serviceoflove.com/uploads/1/3/1/3/131384383/vojuletixumuxi-sigoremasoret-jobomodepe.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_off000064a9.bin
bca4b422b2edbb428de2163b0783cd38ea68ab32158136c0c60ea47400b1e0ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A9 8740 bytes

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