Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad716dfbc2f0e9f…

MALICIOUS

PDF

37.2 KB Created: 2020-06-14 15:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5cf5c806a5ab52006a8be7fd084e43e SHA-1: e097c60c076b4cbf67ff13f47c65d9ae54889a82 SHA-256: fad716dfbc2f0e9f9c31a99c5701ec79d747dc68e83c1ec3fcad6db19dd29f2b
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDF hosting sites. The heuristic 'PDF_SEO_LINK_FARM' strongly suggests this is a link farm intended to drive traffic to various PDF documents hosted on different domains. The document body, though partially corrupted, contains a URL that aligns with this finding. The primary goal appears to be redirecting users through this network of sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://aussiegirlsoap.com/uploads/1/3/0/4/130476262/130476262.html#mayan+calendar+in+tamil+pdf
    • http://cribtalks.com/uploads/1/3/0/4/130436028/8186cb4cbe1b9a.pdf
    • http://sondrafinancialservicesllc.com/uploads/1/3/1/4/131438667/novaxo.pdf
    • http://belsherproperties.com/uploads/1/3/0/2/130288579/nikamefowevenin_birusorajerag_bekiwid_sezebe.pdf
    • http://sarahsheppardsart.com/uploads/1/3/1/8/131872286/disazufezoragep.pdf
    • http://lavenderdreams.us/uploads/1/3/1/3/131380265/lodazugutivigilijako.pdf
    • http://laketownship.info/uploads/1/3/0/5/130551369/silumalug.pdf
    • http://dannyscleaningservices.net/uploads/1/3/0/2/130291575/9601633.pdf
    • https://lubokafokazi.files.wordpress.com/2020/06/87752265880.pdf
    • https://bewenaxo.files.wordpress.com/2020/06/97136358222.pdf
    • https://menorolimi.files.wordpress.com/2020/06/jesasubobozisedobawo.pdf
    • https://regowom.files.wordpress.com/2020/06/67706626369.pdf
    • https://wilewivim.files.wordpress.com/2020/06/pejixusoxekosukoroli.pdf
    • https://nofedexof.files.wordpress.com/2020/06/susuv.pdf
    • https://dajofozi.files.wordpress.com/2020/06/babugulag.pdf
    • https://fadovexige865069747.files.wordpress.com/2020/06/57817088873.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_off000064a5.bin
4295d80ac6e55953d117bc443bf810025b3ce64f1a026442db1b63ab3fe561b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A5 10948 bytes

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