Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad30ae1b46de0d99…

MALICIOUS

PDF

36.9 KB Created: 2020-03-23 08:47:02 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 212f959936a8097797bdf088c18f8d9d SHA-1: 1d2b91ed84aa77bfaf1b43de19ba14f6d7788885 SHA-256: ad30ae1b46de0d998b9fc4655ad8547e4c4ee5e6bf8436bd5ecb96df7a0883bc
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, a technique often used for SEO poisoning or to redirect users to malicious content. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs that are part of this link farm, suggesting the primary purpose is to drive traffic to these external resources.

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://coyshoneyfarm.com/uploads/1/3/0/5/130544136/130544136.html#kuta+software+pre+algebra+volume+of+cylinders+cones+and+spheres+answers
    • http://adventistseniorguide.org/uploads/1/3/0/5/130589008/letulimupolaven-gemoz-tiwam-zisuvobara.pdf
    • http://passmankade.com/uploads/1/3/0/3/130379226/67cdc4fe.pdf
    • http://hengdazuqiujulebubisai.f18.ebkf.org/uploads/1/3/0/6/130604511/netit.pdf
    • http://magnitocomputers.com/uploads/1/3/0/7/130739346/zirepajeguzumeromen.pdf
    • http://flipthe45th.com/uploads/1/3/0/6/130621214/6137dd3df5.pdf
    • http://www.ronballalandscape.com/uploads/1/3/0/3/130323180/faxoxevotisipuf.pdf
    • http://trophyspace.net/uploads/1/3/0/5/130590191/guzari-kenurupuzobibud-fanupawagomajuw.pdf
    • http://travelerswineclub.com/uploads/1/3/0/2/130291499/c25e5c473cc7.pdf
    • http://h20lads.com/uploads/1/3/0/4/130478975/wukonal_zagusiwejorug_wovaxirofet_tojavabire.pdf
    • http://nataliemarie.org/uploads/1/3/0/5/130543133/vorituluja.pdf
    • http://www.nohoweddings.com.au/uploads/1/3/0/8/130814479/855a20b96a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ca9.bin
d5da3f04b69191d62053aa9b3a30d594c4763a9ae5af61a7228a4261984b1b29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA9 1856 bytes
font_01_sfnt_off00006558.bin
c06b80f12cd95d3b4fb585b35206b3ae80d92cba60ac458c889a59ae9c666135		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6558 7696 bytes

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