Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c62469cbd71746f…

MALICIOUS

PDF

35.5 KB Created: 2020-06-11 18:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3179b40725fe9d64511229d52b9aeb56 SHA-1: 4b087c1c89b0001b949cd0b901ac29d9e8795955 SHA-256: 5c62469cbd71746f759759f1834e9a4456baa5e875c4a87a1b1296b6503f42b9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, identified as a link farm, suggesting a malicious intent to redirect users. The document body, though partially obfuscated, includes references to 'Microsoft office mail merge tutorial' and 'wkhtmltopdf', indicating a lure to disguise the malicious links. The presence of embedded URLs and the ML classifier's high confidence score support the assessment of maliciousness.

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://foxarchitects.net/uploads/1/3/1/3/131383900/131383900.html#microsoft+office+mail+merge+tutorial
    • http://bigsplashtrucking.com/uploads/1/3/1/4/131437711/700515.pdf
    • http://koreanchurchofmemphis.org/uploads/1/3/0/4/130436121/tumejolurudoginide.pdf
    • http://leadershiftproject.org/uploads/1/3/0/7/130739646/a536791f6.pdf
    • http://bahamasaugustllc.com/uploads/1/3/1/4/131410939/9773237.pdf
    • http://completecarpetrecovery.com/uploads/1/3/0/2/130289254/rafovulo_badovigaxigirak_jobesokidixapob.pdf
    • http://stillwateroffice.com/uploads/1/3/1/6/131606992/2e9d9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://kufexetironi.files.wordpress.com/2020/06/56018952269.pdf
    • https://pamivibafime.files.wordpress.com/2020/06/2042767342.pdf
    • https://kimoripal.files.wordpress.com/2020/06/22789603861.pdf
    • https://mijukuwojaw.files.wordpress.com/2020/06/rufitenipovidakedemoba.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f3c.bin
20996f0837f84067a2b37df97683e0272b11f75a57509ef69bc91690ece90435		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3C 10536 bytes

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