Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9bf4a0ac5ab05d1…

MALICIOUS

PDF

31.0 KB Created: 2020-05-10 21:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ddc57f53f71bbd80b0584cec8d9971b7 SHA-1: 4df6d257a788c2c9bc9a9157a40155f41a7f7a59 SHA-256: b9bf4a0ac5ab05d193d22697dda2795e5b4d5e4c0e840a8787d1d253a58cae7a
94 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier. It contains a large number of external links, indicating a potential link farm or SEO spam operation. The document body contains a nonsensical string and metadata suggesting it was generated by wkhtmltopdf, which is sometimes used to create malicious PDFs. The primary attack pattern involves directing users to a multitude of external URLs, likely to host further malicious content or engage in SEO manipulation.

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://janettaylor.ca/uploads/1/3/1/1/131164117/131164117.html#paas+aao+na+song+video
    • http://christianlisker.com/uploads/1/3/0/7/130739454/8303625.pdf
    • http://poppyoriginals.com/uploads/1/3/0/2/130272290/7107332.pdf
    • http://cliveandraquel.com/uploads/1/3/0/6/130604048/510901.pdf
    • http://christinapeakhealth.com/uploads/1/3/0/5/130543671/458edc663.pdf
    • http://dianasalinas.net/uploads/1/3/1/0/131070115/xigarod.pdf
    • http://a1mixology.com/uploads/1/3/0/5/130551049/3005789.pdf
    • http://erectordesk.com/uploads/1/3/0/4/130489075/f52f86.pdf
    • http://endwatchers.com/uploads/1/3/0/2/130270799/taxebate.pdf
    • http://activeliferealty.com/uploads/1/3/0/8/130874109/nazorojag-tixewonebo-puseleku.pdf
    • http://paddlingtoparadise.com/uploads/1/3/1/4/131483416/2933558.pdf
    • http://fitnessyogawheel.net/uploads/1/3/1/3/131398003/zewawa_kikilixu_vekafupaxijum_pozogof.pdf
    • http://jcpdrywallllc.com/uploads/1/3/0/6/130605389/pilosufix.pdf
    • http://ccilt.com/uploads/1/3/0/7/130775805/403758.pdf
    • http://fastlanecreations.com/uploads/1/3/0/3/130323214/xitozofijoxozu.pdf
    • http://historicfoodways.com/uploads/1/3/1/4/131407922/31fdd00420c489d.pdf
    • http://erikschutte.com/uploads/1/3/0/9/130969461/bipasevok_dejelexadijo_ruzawiduso_wivebinegufosu.pdf
    • http://concordandcarson.com/uploads/1/3/0/7/130775176/54f513d98be0c.pdf
    • http://sonomacountypickleball.com/uploads/1/3/0/5/130539129/xijowaxop_goset.pdf
    • http://mementomoristudio.net/uploads/1/3/0/5/130539002/jinufararomite_fejaw.pdf
    • http://lashextensionsbyann.com/uploads/1/3/0/4/130483242/rojamanedid-movurolivig.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off00004f92.bin
180e0319968b60dbdfdeb600e00bcab727a881a5a5dabe5a71f993b3159e4626
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F92 9516 bytes