Malicious PDF — malware analysis report

Static analysis result for SHA-256 7872fdd2728c968a…

MALICIOUS

PDF

35.9 KB Created: 2020-06-09 02:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9f472f269f1809913cd1c7340bcbe35 SHA-1: f5381cd28092cb476cda7ef67d6b2c4e90be97b0 SHA-256: 7872fdd2728c968a6a15e338a3a6d8952dd9851333ef9894af817373aa3e166b
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links to external websites, many of which host further PDF files. This behavior is indicative of a link farm or redirection scheme designed to lead users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://coronavirustelehealth.us/uploads/1/3/0/9/130969260/130969260.html#fundamentos+de+engenharia+e+ci%25C3%25AAncia
    • http://lollypopink.com/uploads/1/3/2/3/132303189/7793259.pdf
    • http://sbga63.sbgame.net/uploads/1/3/0/6/130604788/pugeb_kalemamugip_dozoxogo.pdf
    • http://855bet.lucky1st.com/uploads/1/3/0/7/130775306/a87eb09322.pdf
    • http://areapropertybuyers.com/uploads/1/3/0/5/130539990/dawat-besazelat-bebepopomuwelom-petufojaban.pdf
    • http://2wu.undesirable.us/uploads/1/3/0/2/130288522/2795136.pdf
    • http://art-in-venice.com/uploads/1/3/0/8/130874529/5699749.pdf
    • http://hostmaster.suepedley.com.au/uploads/1/3/1/3/131398380/8136161.pdf
    • http://mx.hand-i-maids.com/uploads/1/3/1/1/131164312/3803098.pdf
    • http://alliedcranetoolbox.com/uploads/1/3/0/3/130323229/vipabidubugalagaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://nuvazizofo299183167.files.wordpress.com/2020/06/tikorukexogotakadilemi.pdf
    • https://wilopag.files.wordpress.com/2020/06/14086221263.pdf
    • https://mewalijovil.files.wordpress.com/2020/06/genadakijolilepes.pdf
    • https://zitipon.files.wordpress.com/2020/06/lexasujagafuk.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_off00005bfe.bin
add49072f7b7ebb4db3e675d899acd4abed9e425a4670621f7bd703208a8aa1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BFE 13064 bytes

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