Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e881f1f953e93e…

MALICIOUS

PDF

31.2 KB Created: 2020-06-05 05:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 079a0570e69ec670b61b5095e76a64fb SHA-1: 88a38b26d66e11e42d08e01009d4cd64d1eabb31 SHA-256: 52e881f1f953e93e49be8bc88ea2f6d3a8fb5b924f608da69501af782c46d595
94 Risk Score

Malware Insights

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

The PDF document contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains a URL that matches one of the extracted links, suggesting a lure. The primary attack pattern involves directing users to a large farm of linked PDF files hosted on various domains.

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://clucktruckportland.com/uploads/1/3/0/6/130604826/130604826.html#davy+jones+plays+his+organ+sheet+music
    • http://dejavumeridian.com/uploads/1/3/0/6/130604902/23842.pdf
    • http://viajescompartidos.net/uploads/1/3/1/8/131871593/rapugeraxadile_tufup.pdf
    • http://gretchenlefeverwatson.com/uploads/1/3/0/6/130605448/lamusarapajosig_vofiwiti.pdf
    • http://jacobusrestaurant.nl/uploads/1/3/1/4/131454033/8931567.pdf
    • http://kmmaintenance.org/uploads/1/3/1/4/131454040/c85874aa88e.pdf
    • http://synergychurch.info/uploads/1/3/0/6/130620945/9f9c1b4d429.pdf
    • http://mail.redlotusclinic.com/uploads/1/3/1/6/131636843/9ff9e7.pdf
    • http://clucktruckportland.com/uploads/1/3/0/6/130604826/terms.html
    • http://clucktruckportland.com/uploads/1/3/0/6/130604826/dmca.html
    • http://clucktruckportland.com/uploads/1/3/0/6/130604826/policy.html
    • https://wonafuburos.files.wordpress.com/2020/06/gagimi.pdf
    • https://bokisutedex.files.wordpress.com/2020/06/wokemitoniliriju.pdf
    • https://kisinawaku.files.wordpress.com/2020/06/78567037027.pdf
    • https://panuvezipib.files.wordpress.com/2020/06/wadiwik.pdf
    • https://bomutap.files.wordpress.com/2020/06/fabojofadaj.pdf
    • https://sokesepupune.files.wordpress.com/2020/06/zitamepuzujid.pdf
    • https://vasibonelivu.files.wordpress.com/2020/06/pojadawa.pdf
    • https://woxujobeza.files.wordpress.com/2020/06/donigu.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_off00004e80.bin
7b3626103eecfdf3ce88e6fe3db081f3e6238b49e566f5222f69f0b334cf6dbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E80 10184 bytes

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