Malicious PDF — malware analysis report

Static analysis result for SHA-256 01eb32c83884db6b…

MALICIOUS

PDF

42.6 KB Created: 2020-03-08 10:28:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3c51c95d6f4b64dd1d57de209f3b4fa7 SHA-1: 371eefd0d1ec3858ff4efe7285a979b65ada60fb SHA-256: 01eb32c83884db6b314ab0f83a542d587df7509792886a8bd08743a0fcf24c11
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, as detected by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to a vast network of linked PDF files hosted on numerous domains, which is a common tactic for SEO manipulation or distributing malware.

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://lebojin.br3h.com/uploads/1/3/0/3/130313021/130313021.html#prefixes+and+suffixes+list+in+english
    • http://brewwber.com/uploads/1/3/0/3/130324164/7879878.pdf
    • http://charlotteconsciousconnections.com/uploads/1/3/0/7/130739190/4eedbfa194d97c.pdf
    • http://www.language-koach.nl/uploads/1/3/0/5/130588506/kolatijag_pikukatut_tejurafube.pdf
    • http://precariouslypossible.net/uploads/1/3/0/5/130547515/eccab7181936.pdf
    • http://infectiousproductions.com/uploads/1/3/0/5/130551505/5283389.pdf
    • http://mail.fsxliveries.com/uploads/1/3/0/8/130874678/cdab464cef.pdf
    • http://thehnossaproject.com/uploads/1/3/0/2/130271139/pifefit-zuzegageparaneb-botelexi.pdf
    • http://braeswoodapartments.com/uploads/1/3/0/6/130621511/7615809.pdf
    • http://unkledesigns.com/uploads/1/3/0/6/130621864/kavisem.pdf
    • http://actionstepsnetwork.com/uploads/1/3/0/7/130775719/4318876.pdf
    • http://thesh3god.com/uploads/1/3/0/7/130775489/pipivu.pdf
    • http://www.astraplus.net/uploads/1/3/0/6/130604209/7671846.pdf
    • http://mta-sts.selectbuildersinc.com/uploads/1/3/0/6/130621490/mifefuvatet.pdf
    • http://woodlandslearntoskate.aerodromes.com/uploads/1/3/0/7/130775376/82b540ca83ee7d.pdf
    • http://volareestheticsbykali.net/uploads/1/3/1/0/131071256/tenaxutokumu.pdf
    • http://lapiedradelsol.com/uploads/1/3/0/5/130551457/tiworowizudolidamox.pdf
    • http://brandbeauty.net/uploads/1/3/0/3/130324351/fizazunadud-divof-xafareme.pdf
    • http://maurobattaglia.space/uploads/1/3/0/4/130489909/6036111.pdf
    • http://www.g7esports.com/uploads/1/3/0/5/130588533/9599071.pdf
    • http://theilovemebrand.com/uploads/1/3/0/5/130538817/704cc2b.pdf
    • http://brandinnovation.site/uploads/1/3/0/2/130272344/rififa_xikazufulanu.pdf
    • http://kptcs-kylinprime.com/uploads/1/3/0/6/130621511/vibixavanasegab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007441.bin
fd2b5141f1b4a5228a79ed6b64fcec3a49b99c5e621fb046cb67765a4a0aa688		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7441 7788 bytes
font_01_sfnt_off000092d8.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92D8 2652 bytes

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