Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f27ecfdb31c696…

MALICIOUS

PDF

70.2 KB Created: 2020-05-16 17:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 376ee48ededcb3d388912deb3827a7ac SHA-1: f3b4a34e78bd446229424cc75bfbd66acb6c93c2 SHA-256: 85f27ecfdb31c6960b7e78019a48ee34884faf7f6188c5f77fa23022c8ad1a3c
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a technique often used to create SEO link farms for malicious purposes. The ML classifier strongly indicated maliciousness. The document body contains garbled text and what appears to be metadata from the wkhtmltopdf tool, suggesting it was programmatically generated to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://drobgyn.net/uploads/1/3/1/0/131069759/131069759.html#beden+dili+%25C3%25B6%25C4%259Frenme+pdf
    • http://nishanonprofit.org/uploads/1/3/0/7/130739348/tenudikowo.pdf
    • http://tuitionhotsauce.com/uploads/1/3/0/9/130969997/78a04e65b.pdf
    • http://jashercorp.com/uploads/1/3/0/4/130476910/nawabutimasuwuzojet.pdf
    • http://cleanmypoolsugarland.com/uploads/1/3/0/6/130621294/f5defd7.pdf
    • http://desertmoonmusiclessons.com/uploads/1/3/0/2/130289778/9420298.pdf
    • http://theglambarleeds.com/uploads/1/3/0/6/130604289/7901228.pdf
    • http://fortkortlaw.com/uploads/1/3/0/8/130813447/wanabepoberigu.pdf
    • http://fountainoflifesupportservices.org/uploads/1/3/1/4/131438610/jukowiwesulozuruto.pdf
    • http://greekfolkreligion.com/uploads/1/3/0/6/130604585/5274527.pdf
    • http://arlenebuster.com/uploads/1/3/0/8/130874128/fevurus-detero.pdf
    • http://bcproductdeals.com/uploads/1/3/1/1/131164549/muvofewifuxipo_niguvusaludoz_rukopoj.pdf
    • http://yourlocalmystics.com/uploads/1/3/0/8/130874410/kadadudunem.pdf
    • http://nusgss.org/uploads/1/3/0/7/130739773/4398463.pdf
    • http://laqualitanellatuacucina.com/uploads/1/3/1/1/131164531/bowiboz_podixenawiso_vupufepijogido_bewizituzevi.pdf
    • http://mevonnedobson.com/uploads/1/3/0/8/130814735/zubumofagorepe.pdf
    • http://belesiscafe.com/uploads/1/3/1/8/131871817/46fa967.pdf
    • http://fishingcountrynow.com/uploads/1/3/0/2/130291623/08f3d33.pdf
    • http://minakayyalieventplanning.com/uploads/1/3/0/2/130273893/8490616.pdf
    • http://screensondemand.com/uploads/1/3/0/5/130540065/xesobidul_bafutiwewaje.pdf
    • http://simplyscottishancestry.com/uploads/1/3/1/6/131637395/marorujemesan-fuwifejumanuw.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_off0000e446.bin
fad9e14292184e84b2ab959a04f5b3b768b6ea4da92563dff1385349ec2470e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE446 12384 bytes