Malicious PDF — malware analysis report

Static analysis result for SHA-256 0040d4a419bdca42…

MALICIOUS

PDF

35.4 KB Created: 2020-04-01 15:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1afb9a475ed1bc9116eccacf1d57b5ce SHA-1: cec5ac40fa3ebadb927c0a37b6753a4fc2a31b5e SHA-256: 0040d4a419bdca4263161186401a8399eaaaeec85a4a2032908ead78a9e070e7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a large number of external links, identified as a link farm, pointing to various PDF files hosted on different domains. This technique is often used for SEO manipulation or to distribute malicious payloads. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious nature of the embedded 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://amemploymentconsultants.com/uploads/1/3/0/7/130740022/130740022.html#hershey%27s+mini+chocolate+bar+nutrition
    • http://host51.tri-waymold.com/uploads/1/3/0/3/130379674/2247679.pdf
    • http://hayesmorgan.net/uploads/1/3/0/6/130620512/woxalin-mabukowilojopij-wesamegito.pdf
    • http://ajceindonesia.com/uploads/1/3/0/7/130775897/8927573.pdf
    • http://dress247.net/uploads/1/3/0/5/130588710/xenalizawegopug.pdf
    • http://baygrownfarms.com/uploads/1/3/0/6/130639486/damubatebidipovomol.pdf
    • http://macaroonzi.com/uploads/1/3/1/4/131438099/razino.pdf
    • http://sargentlistings.com/uploads/1/3/0/6/130605028/8026389.pdf
    • http://djromaine.com/uploads/1/3/0/6/130604672/1098072.pdf
    • http://upainspace.com/uploads/1/3/0/7/130776197/44821ce29bb7.pdf
    • http://aconvergentinvestment.com/uploads/1/3/0/5/130588999/zepekalikur.pdf
    • http://skylineunlimitedinc.com/uploads/1/3/0/7/130775118/0e3c5f4.pdf
    • http://bridgestreampublishing.com/uploads/1/3/0/6/130622073/22a73cbcd3.pdf
    • http://campowasa.com/uploads/1/3/0/6/130604924/5ca420713.pdf
    • http://matkaswim.com/uploads/1/3/0/4/130483207/7436052.pdf
    • http://driftwooddesignsuk.com/uploads/1/3/0/6/130639488/cbc20b285f595a0.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_off0000635b.bin
da8279d7dd2af169e562183f881933467d13c8e67afcd858025bb2cc9cfea37f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x635B 7444 bytes

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