Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eefa053a4c9d58e…

MALICIOUS

PDF

46.2 KB Created: 2020-03-11 07:53:53 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2cc3f5b3072a8cb87c78f9f1f9613468 SHA-1: e3a8ce92d9c13505193b75b7aca6ec78a2b40f49 SHA-256: 8eefa053a4c9d58e338aee596db9ad6745b4bde1d290e0f5fde541dc5f9ee649
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, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body contains text related to online tests and application forms, which likely serves as a lure to encourage users to click the embedded links.

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://hxqh8.bpmtc.com/uploads/1/3/0/6/130621272/130621272.html#free+online+mock+test+for+afcat+2019
    • http://nadzorybudowlane-arles.pl/uploads/1/3/0/3/130313359/pewinuxug.pdf
    • http://shinrin-yoku.site/uploads/1/3/0/8/130814529/kumeduxuzaze.pdf
    • http://www.workwithtpc.com/uploads/1/3/0/8/130874104/6214854.pdf
    • http://shopjdmonline.com/uploads/1/3/0/9/130969980/90158d04e4c.pdf
    • http://www.etefl.online/uploads/1/3/0/5/130543099/wukefigibal_mibodujit_jojapalebidewu.pdf
    • http://jminvestmentplanning.com/uploads/1/3/0/4/130435998/d64334.pdf
    • http://adelaidehulahoopers.com.au/uploads/1/3/0/2/130274076/tarid_pewojafax_wukizawofavutuz.pdf
    • http://terrapin-llc.com/uploads/1/3/0/6/130621717/wozofafovolu.pdf
    • http://shop.bigstuf.com/uploads/1/3/0/6/130603878/9995988.pdf
    • http://noreymetalart.com/uploads/1/3/0/6/130603988/medosolixibetej.pdf
    • http://kogut-design.com/uploads/1/3/0/7/130775537/mizufe.pdf
    • http://stahlhuthreeds.com/uploads/1/3/0/8/130814393/xajivebetonovogasaz.pdf
    • http://onandoffsa.com/uploads/1/3/0/6/130605230/3c43211b6.pdf
    • http://gabrielleoconnell.com/uploads/1/3/0/5/130551103/gupavax_lepupe_kodefe.pdf
    • http://9f60dnj005.com/uploads/1/3/0/2/130272242/gojojifap-satoraluv-vufisefared.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_off00007664.bin
911f0e034f6bf1fec0c83dddc646d4ecef7457af02c652f6de3e7e256cd67af7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7664 8292 bytes
font_01_sfnt_off00009622.bin
50dc865112b31b8628c9170d82daeefa18b8227744a71909c0440548ffdcd4ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9622 16132 bytes

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