Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16089d5a2dd37f1…

MALICIOUS

PDF

44.2 KB Created: 2020-04-08 13:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ca548df7a48c7b5c554241d602c5c199 SHA-1: d5db8aa89fc5a76d13b7aba1a53b5ffe696f85c2 SHA-256: e16089d5a2dd37f14cca0abae28ca640ab8d0ac9b274b6aecdcac6013e48cdfc
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on domains that appear to be part of a link farm. The document body, though heavily obfuscated, contains references to educational materials, suggesting a lure to disguise the malicious nature of the embedded links. The ML classifier strongly indicated maliciousness, supporting the presence of a link farm designed to distribute malicious content.

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://tuitionhotsauce.com/uploads/1/3/1/4/131438293/131438293.html#prentice+hall+literature+all+in+one+workbook+answers+grade+7
    • http://byingtondesigns.com/uploads/1/3/0/5/130543684/5673072.pdf
    • http://taniapenarubio.com/uploads/1/3/1/1/131163984/rimavepa.pdf
    • http://frustratedartist.org/uploads/1/3/1/3/131379443/30bdb1c37bfdd86.pdf
    • http://dandrive-pedal.com/uploads/1/3/0/4/130435555/mimiwopowuvega_torudasovilu_forunividev_tewizi.pdf
    • http://yujiaohong.com/uploads/1/3/0/6/130639489/banekunubarefu.pdf
    • http://danilia-menale.com/uploads/1/3/0/5/130539130/jigujivami.pdf
    • http://ms-kc.com/uploads/1/3/0/6/130621432/niwikowade.pdf
    • http://trdogwalking.com/uploads/1/3/0/5/130588567/fd22a5dbee806.pdf
    • http://t-bart.com/uploads/1/3/0/6/130604770/zikeropunebabegori.pdf
    • http://petbedcovers.net/uploads/1/3/0/5/130550770/bawazukig_lewobokig_babazofigide.pdf
    • http://whippysnippy.com/uploads/1/3/1/4/131438767/rigupaxavekesi.pdf
    • http://mainelawnservice.com/uploads/1/3/0/9/130969489/woxutetorugejewev.pdf
    • http://merchantkarma.com/uploads/1/3/0/4/130436285/38cff811653.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_off00007fe8.bin
bcc2026c39a1945ea36cc115be6e89cbce3197dd811f6f26536addd6e2a22989		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE8 9220 bytes

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