Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cba3ef45bd6f2a5…

MALICIOUS

PDF

35.9 KB Created: 2020-04-07 13:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: db198e98b300d17ed80290af79edc69a SHA-1: 8c324f45a8d87c6b907c108dbc3f0786cd19f169 SHA-256: 9cba3ef45bd6f2a52d78e2433a2b0d9d5d4b9f7a6b74938cca671f1955ba19d9
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF document contains a large number of external links, many of which are numerically or generically named PDF files hosted on various domains. The document body contains text related to 'Qiagen dna extraction kit tissue', suggesting a lure to attract users to these linked resources. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm designed to manipulate search engine results or distribute malicious content. The primary attack pattern involves directing users to a network of suspicious external URLs.

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://ciggysound.com/uploads/1/3/1/4/131437625/131437625.html#qiagen+dna+extraction+kit+tissue
    • http://liunalocal607.com/uploads/1/3/0/6/130639755/4351278.pdf
    • http://bareconcepts.us/uploads/1/3/0/4/130483902/8496804.pdf
    • http://santabarbaraairstream.com/uploads/1/3/1/4/131453602/tiduxutomurusesu.pdf
    • http://juegoexisto.com/uploads/1/3/0/3/130324385/7960424.pdf
    • http://blacksinphilanthropy.net/uploads/1/3/1/4/131455247/wikilagekaxaxa.pdf
    • http://broncosandlaceco.com/uploads/1/3/0/8/130814193/wimoso-wujopuzinamawap-xulibazubeva-sofufore.pdf
    • http://craftyknotts.com/uploads/1/3/1/4/131438275/337229.pdf
    • http://ips-bdpreso.com/uploads/1/3/1/0/131070212/watarusi-gorugugat.pdf
    • http://givevolunteers.org/uploads/1/3/0/3/130323222/netitigerafe.pdf
    • http://teachingaustin.com/uploads/1/3/0/3/130379078/konaverigejev_waragimapeg.pdf
    • http://forget-it-not.com/uploads/1/3/0/7/130739553/635a43dd.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_off0000640c.bin
19c9b8f75fb2732aeff7d1c57d5346cdaf624b99ea97d8cbcbb789b09c5c0456		 pdf-font-stream PDF embedded font (sfnt) at offset 0x640C 7980 bytes

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