Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb32243048ebab6…

MALICIOUS

PDF

42.2 KB Created: 2020-03-30 03:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: faec31fde2e6a853fd6dfb5018e4790d SHA-1: ff0b0f68e519a24a01fb0f9cd150c5037a8a092c SHA-256: cbb32243048ebab6956230313db36ee95a27425e512872a5db668edf4f08ebf6
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm designed to manipulate search engine results. The document body contains text related to medical codes, likely a lure to entice users to click on the embedded malicious URLs. The ML classifier strongly indicated maliciousness.

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://clucktruckportland.com/uploads/1/3/1/4/131436991/131436991.html#icd+10+code+for+nausea+and+vomiting+after+surgery
    • http://firesidecraft.com/uploads/1/3/0/7/130775436/3935494.pdf
    • http://midwesternchristianacademy.org/uploads/1/3/0/2/130289335/ce8b83a44b11c.pdf
    • http://feriadeinternet.com/uploads/1/3/0/8/130874258/9b8069.pdf
    • http://samayaproduction.com/uploads/1/3/0/7/130776854/320352.pdf
    • http://hypnotherapyforwellbeing.com/uploads/1/3/0/7/130740566/viwiketuzagar.pdf
    • http://shoptopsttar.site/uploads/1/3/0/2/130270917/198582.pdf
    • http://wklogisticsllc.com/uploads/1/3/1/4/131437546/gibepixe-jopumevezuvewi-sesitabonulu-tigawi.pdf
    • http://1saleatatime.com/uploads/1/3/0/6/130620197/tugobaduwenez.pdf
    • http://blueraptorslearning.com/uploads/1/3/0/2/130289393/6880175.pdf
    • http://rescuedada.net/uploads/1/3/0/7/130776629/5721434.pdf
    • http://hostmaster.buymyoldvehicle-peterborough.co.uk/uploads/1/3/0/5/130547340/fimazaviloj.pdf
    • http://hostalhabana1935.com/uploads/1/3/1/4/131407921/liledemije.pdf
    • http://easybrackets.com/uploads/1/3/0/6/130620979/gerogox.pdf
    • http://lacuriowines.com/uploads/1/3/0/7/130739324/fifet.pdf
    • http://cg-people.com/uploads/1/3/0/5/130543663/zusokisesu_vakudimivesabu_guvaduvad.pdf
    • http://run-u-nut.org/uploads/1/3/1/0/131070982/8230626.pdf
    • http://vinettemarketing.com/uploads/1/3/0/5/130551750/f05ac0de2f2.pdf
    • http://softesthard.com/uploads/1/3/0/7/130775504/2851013.pdf
    • http://elitlok.fr/uploads/1/3/0/8/130814341/5386971.pdf
    • http://tripblazer.com/uploads/1/3/0/2/130273804/5c8ad65e8bc87.pdf
    • http://bymarysflowers.com/uploads/1/3/1/4/131407370/155911.pdf
    • http://claireekraus.net/uploads/1/3/0/7/130776644/fusalorapojixojikuli.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_off00007bbf.bin
0057e083d16ff280026878924e663e39e3d00860cd9454fdc7197a04b267ef83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BBF 8116 bytes

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