Malicious PDF — malware analysis report

Static analysis result for SHA-256 28de446759112682…

MALICIOUS

PDF

46.8 KB Created: 2020-03-20 11:03:11 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 34c469e7d83db8f941ac36ec15902f77 SHA-1: 27931ce2f708ab7300e0990fec957fc199710ff4 SHA-256: 28de4467591126829bd4ea3683edb3373b6083e47deec2e9a930b6b652d1285d
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The embedded URLs point to various domains, suggesting a link farm designed to distribute traffic or 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://bethelchurchlife.com/uploads/1/3/0/8/130814284/130814284.html#find+equation+of+a+perpendicular+line+calculator
    • http://pinebyte.com/uploads/1/3/0/5/130540033/gepepuwelidawufep.pdf
    • http://fa-vinyl.com/uploads/1/3/0/5/130588864/7899215.pdf
    • http://glenysrivas.com/uploads/1/3/0/2/130272631/lelitatutem-gumilikusomu-jajozabibat-doxubi.pdf
    • http://4gwireless.com/uploads/1/3/0/6/130639157/muduj.pdf
    • http://theleiflibrary.com/uploads/1/3/0/8/130874095/6d29799365062.pdf
    • http://theactivespot.com/uploads/1/3/1/0/131069897/mugexake.pdf
    • http://burkedefenselaw.net/uploads/1/3/0/7/130776434/litusoxunufiboviwipi.pdf
    • http://catalog.koehlerscale.com/uploads/1/3/0/7/130740513/a9b9764597b1.pdf
    • http://rentsfnow.net/uploads/1/3/0/6/130639083/420012.pdf
    • http://ottumwasymphonyorchestra.com/uploads/1/3/0/3/130323709/lipum.pdf
    • http://pmgfiletransfer.com/uploads/1/3/0/5/130538985/a2232da38.pdf
    • http://www.smokeyjoestobacco.com/uploads/1/3/0/5/130590368/vojiziwazen.pdf
    • http://sarahmelton.com/uploads/1/3/0/3/130323814/vogasaf.pdf
    • http://robanka.com/uploads/1/3/0/9/130969981/nutiva.pdf
    • http://atenziarecords.com/uploads/1/3/0/6/130639841/vawumuleramafejok.pdf
    • http://www.beavalentine.com/uploads/1/3/0/8/130814871/8ac8196e2.pdf
    • http://mantrafarm.com/uploads/1/3/0/6/130621162/471e5e71f9c77.pdf
    • http://www.yourpacetours.com/uploads/1/3/0/7/130775392/5165836.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_off00007520.bin
c38664da18b66b7e6bbd717be8d214ca9a81058556f7915cd9e87015f75ca188		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7520 9104 bytes
font_01_sfnt_off000097fc.bin
fccfb55b6fefd9f1474750a727d75d2f98c61972c9f6d17c0a37913170daa784		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97FC 16136 bytes

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