Malicious PDF — malware analysis report

Static analysis result for SHA-256 26599bacaf609f19…

MALICIOUS

PDF

47.3 KB Created: 2020-03-25 14:05:14 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f6c8801a93750ab41da72bfc82d2769e SHA-1: 33c70fa4e18f62730b7eb1400b34bcbbec8d0135 SHA-256: 26599bacaf609f192d0f3756d85464ecbd4a6e19f17d9f973113421b61ff8476
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many with numeric or book-related slugs, indicating a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious. The embedded URLs, such as http://firasheet.com/uploads/1/3/0/6/130621345/130621345.html#the+bane+chronicles+book+2+pdf, are likely used to redirect users to malicious content or further stages of an attack.

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://firasheet.com/uploads/1/3/0/6/130621345/130621345.html#the+bane+chronicles+book+2+pdf
    • http://www.25months.com/uploads/1/3/0/3/130323754/finupanidivoxezovola.pdf
    • http://bluespherelogistics.us/uploads/1/3/0/9/130969763/9132055.pdf
    • http://www.twoteachersabroad.com/uploads/1/3/0/6/130604090/6956084.pdf
    • http://nfbnation.com/uploads/1/3/0/9/130969143/xumulovuvoputifetuza.pdf
    • http://rabidrabs.org/uploads/1/3/0/2/130289476/vaxidupagumov_juxiwisibepi.pdf
    • http://ashleighpetts.com/uploads/1/3/0/4/130483494/gevod-wepobofel.pdf
    • http://lippincottllp.com/uploads/1/3/0/6/130621964/xesatipux.pdf
    • http://hostmaster.kayscutz.com/uploads/1/3/0/8/130813859/nadosewazave-pegetewisupitad-gabatamaxazugoj.pdf
    • http://www.gameinquisitor.com/uploads/1/3/0/8/130874514/makasaxo.pdf
    • http://ezekielmccarter.com/uploads/1/3/1/0/131069838/6894811.pdf
    • http://blackedgold.com/uploads/1/3/0/2/130287992/578a2.pdf
    • http://www.releasingpotential.org/uploads/1/3/0/4/130435638/gomomatar_juvib_ribaruzurel.pdf
    • http://harvesttheworld.com/uploads/1/3/0/2/130271206/kikememuwad.pdf
    • http://finegerman.com/uploads/1/3/0/4/130436159/ledafozimorebuneja.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_off000090d8.bin
f062b5f54855b04f298b6e7c7444627e61956c60d97ddd1ec6cf5b4d014c190d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90D8 8152 bytes

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