Malicious PDF — malware analysis report

Static analysis result for SHA-256 99535272e5b67b82…

MALICIOUS

PDF

36.8 KB Created: 2020-04-08 03:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d514a83fd7548b17756465df3bf1f1ad SHA-1: c334808c7173384b53a54f9f413b4cd119da04ba SHA-256: 99535272e5b67b8204649337f85c8d06eb3bb97cfcaf4093303bc5a5dabddf6a
94 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO spam or to direct users to malicious websites. The ML classifier strongly flagged this PDF as malicious. The document body text, while seemingly innocuous, is likely a lure to disguise the malicious intent of the embedded links.

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://lovejoypeacellc.org/uploads/1/3/0/6/130621895/130621895.html#how+many+calories+are+in+a+slice+of+papa+john%27s+sausage+pizza
    • http://zamecoproducts.com/uploads/1/3/0/8/130874126/50448eb.pdf
    • http://foodbyfifi.com/uploads/1/3/1/3/131398429/dirufeluze_zawevabedini_fuvapojodimaf.pdf
    • http://ariannavassallo.com/uploads/1/3/0/5/130544447/powizosomot.pdf
    • http://makeartsforabetterlife.org/uploads/1/3/0/7/130775647/devusosoj_bamosuwutut_zitumito.pdf
    • http://elisestone.com/uploads/1/3/0/5/130542924/7633f1b2f473d4.pdf
    • http://hcs-conference.com/uploads/1/3/1/3/131383380/8262214.pdf
    • http://playingsuperhereos.com/uploads/1/3/0/4/130476786/9671534.pdf
    • http://chefjasonhoward.com/uploads/1/3/0/9/130969993/5305606.pdf
    • http://tweedlefilms.com/uploads/1/3/0/4/130477026/tuvuponuxelixojeruj.pdf
    • http://elexxtech.com/uploads/1/3/0/8/130814575/bedaguropew_wowaj.pdf
    • http://gaithersburgcarpetcleaning.biz/uploads/1/3/1/4/131411078/vuboxakisodogedov.pdf
    • http://glittergoose.com/uploads/1/3/1/3/131379439/5089899.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_off00006586.bin
0c9a9477fa7b51d88e537458efddfc3da3a0bac5c93c9403f130b99534642a5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6586 7728 bytes

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