Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa98ac1fd3dde83c…

MALICIOUS

PDF

42.8 KB Created: 2020-03-11 09:57:16 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ef49ba15dd8f95abeb48bc2e3788e302 SHA-1: 38bbc2c8617cb1cade3b134d0e0dd2d45d1a353f SHA-256: aa98ac1fd3dde83c8766b251c2cc5ae99ef58eacbc0a7524723b5fa484dc32eb
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 or SEO poisoning tactic. The document body, though heavily obfuscated, contains a URL that appears to be a lure related to a 'pharmaceutical sales action plan'. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to potentially malicious external sites.

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://elizabethbrophy.com/uploads/1/3/0/6/130639831/130639831.html#pharmaceutical+sales+action+plan+sample
    • http://nycelitehealth.com/uploads/1/3/0/6/130639140/bokazuwiso.pdf
    • http://www.cellsmith.net/uploads/1/3/0/6/130640078/juzak_famebinanes_goguwepi_moxeluditimag.pdf
    • http://ashleymorgancustom.com/uploads/1/3/0/5/130590142/luniron_lekepufokax.pdf
    • http://internationalrealestateinvestmentforum.com/uploads/1/3/0/5/130550834/5784522.pdf
    • http://premedicated.net/uploads/1/3/0/5/130588842/kuromoxulugaj-wanib-wixolig-benemex.pdf
    • http://shop.lease/uploads/1/3/0/4/130476624/mepuzem.pdf
    • http://4550-experience.com/uploads/1/3/0/6/130621462/1adc5f6d36449.pdf
    • http://mail.thepottershousegallery.com/uploads/1/3/0/5/130588304/tajejo.pdf
    • http://autodiscover.muzikale.nl/uploads/1/3/0/7/130776433/rojosowaf.pdf
    • http://scoresgrill.ca/uploads/1/3/0/2/130287914/raxejev-potena-tujimawati-fevit.pdf
    • http://pianoninja.net/uploads/1/3/0/8/130813095/c8a114de38806.pdf
    • http://w-sind.com/uploads/1/3/0/2/130272921/80f049dd81c6d.pdf
    • http://jeanbaptistevivier.com/uploads/1/3/0/5/130544321/ab363d617.pdf
    • http://sellshousefast4cash.com/uploads/1/3/0/5/130542937/pusarexej_tevomotuz_kalofigu_dijed.pdf
    • http://rollinghillswa.com/uploads/1/3/0/7/130739450/6636921.pdf
    • http://74-123-78-96.mgwnet.com/uploads/1/3/0/2/130272260/kixekikoxeteze.pdf
    • http://lilylayne.com/uploads/1/3/0/7/130775278/tozibajefowe.pdf
    • http://www.ronlovelace.net/uploads/1/3/0/2/130288626/kiwosizav-geviru.pdf
    • http://driving-school.pdio.ca/uploads/1/3/0/5/130588477/2857856.pdf
    • http://www.shop.thegrillhousecompany.com/uploads/1/3/0/7/130775440/fb639cd.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_off00007e23.bin
85452ec504b1c372f2be6faf50df2233d4834a9e526e96b38d1841739459bbd6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E23 8000 bytes