Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8e3518837ce21e…

MALICIOUS

PDF

41.6 KB Created: 2020-03-08 04:24:47 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2d91cd7b47ceb0a7ca88624829f0ceb6 SHA-1: dcdca8f5b8cb16ad00983f135186253fb1216c39 SHA-256: eb8e3518837ce21ebcf6652f331cae11cf7da400f56b16703e4ff445b328153e
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body text, though partially garbled, contains references to 'Fiba 3x3 official basketball rules' and 'wkhtmltopdf', suggesting a lure document. The primary attack pattern involves redirecting users to numerous external URLs, likely for SEO spam or to host further 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://www.burracing.com/uploads/1/3/0/9/130969718/130969718.html#fiba+3%C3%973+official+basketball+rules
    • http://hostmaster.journeyhappyfit.com/uploads/1/3/0/2/130289341/guripegopita-vuzurojubuxez-japewakusim.pdf
    • http://mail.hbhospice.com/uploads/1/3/0/4/130490609/rirupavedizod_labejid_mogudumimo_gidijipasop.pdf
    • http://mybowtieproduction.com/uploads/1/3/0/6/130604406/996929.pdf
    • http://supertoadrecord.com/uploads/1/3/0/6/130604560/lobesoxi_juluf_pixafonunu.pdf
    • http://strategiesmd.com/uploads/1/3/0/5/130590140/gitusarukuwivopitog.pdf
    • http://harnesshorses.org/uploads/1/3/0/6/130604980/40205dd83fb.pdf
    • http://hostmaster.myukip.com/uploads/1/3/1/0/131070351/09ab94ae4ceb6a.pdf
    • http://seezadar.com/uploads/1/3/0/7/130738680/nosiz-jimogiro.pdf
    • http://thewayofthebike.com/uploads/1/3/0/8/130873902/3807c03fe4.pdf
    • http://qtmchain.com/uploads/1/3/0/7/130740211/1481932.pdf
    • http://www.cdstonemath20d.net/uploads/1/3/0/4/130488213/bb6438abe70.pdf
    • http://gibsontina.com/uploads/1/3/0/7/130776646/1418828.pdf
    • http://eatonmediaservices.com/uploads/1/3/0/4/130476821/7651347.pdf
    • http://therapiness.co.uk/uploads/1/3/0/7/130738615/fefobimikaxus.pdf
    • http://gtbcf.org/uploads/1/3/0/4/130489262/xedaxeredude_revatuwogo_pesixonagi_dakomolewokudog.pdf
    • http://www.estudioladehesa.com/uploads/1/3/0/2/130274267/067016a58.pdf
    • http://animeblogger.org/uploads/1/3/0/5/130589036/5008497.pdf
    • http://doublecfarms.net/uploads/1/3/0/7/130775554/1565096.pdf
    • http://themastectomystore.com/uploads/1/3/0/6/130639905/wilodojaraz.pdf
    • http://bmcomput.com/uploads/1/3/0/2/130288321/90d975b2db19.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_off00007933.bin
e405c54ad7ba34e721991766cd09bfa9e002c03b8d0d89995803464e180038fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7933 7520 bytes

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