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) First seen: 2020-09-04
MD5: 376ee48ededcb3d388912deb3827a7ac SHA-1: f3b4a34e78bd446229424cc75bfbd66acb6c93c2 SHA-256: 85f27ecfdb31c6960b7e78019a48ee34884faf7f6188c5f77fa23022c8ad1a3c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which appear to be part of a link farm designed to mimic educational content. The primary URL, http://drobgyn.net/uploads/1/3/1/0/131069759/131069759.html#beden+dili+%25C3%25B6%25C4%259Frenme+pdf, suggests a lure related to learning Turkish. The ML classifier strongly indicates maliciousness, and the structure points towards a campaign distributing malicious content via 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 PDF link annotation
    • http://nishanonprofit.org/uploads/1/3/0/7/130739348/tenudikowo.pdfIn PDF document text
    • http://tuitionhotsauce.com/uploads/1/3/0/9/130969997/78a04e65b.pdfIn PDF document text
    • http://jashercorp.com/uploads/1/3/0/4/130476910/nawabutimasuwuzojet.pdfIn PDF document text
    • http://cleanmypoolsugarland.com/uploads/1/3/0/6/130621294/f5defd7.pdfIn PDF document text
    • http://desertmoonmusiclessons.com/uploads/1/3/0/2/130289778/9420298.pdfIn PDF document text
    • http://theglambarleeds.com/uploads/1/3/0/6/130604289/7901228.pdfIn PDF document text
    • http://fortkortlaw.com/uploads/1/3/0/8/130813447/wanabepoberigu.pdfIn PDF document text
    • http://fountainoflifesupportservices.org/uploads/1/3/1/4/131438610/jukowiwesulozuruto.pdfIn PDF document text
    • http://greekfolkreligion.com/uploads/1/3/0/6/130604585/5274527.pdfIn PDF document text
    • http://arlenebuster.com/uploads/1/3/0/8/130874128/fevurus-detero.pdfIn PDF document text
    • http://bcproductdeals.com/uploads/1/3/1/1/131164549/muvofewifuxipo_niguvusaludoz_rukopoj.pdfIn PDF document text
    • http://yourlocalmystics.com/uploads/1/3/0/8/130874410/kadadudunem.pdfIn PDF document text
    • http://nusgss.org/uploads/1/3/0/7/130739773/4398463.pdfIn PDF document text
    • http://laqualitanellatuacucina.com/uploads/1/3/1/1/131164531/bowiboz_podixenawiso_vupufepijogido_bewizituzevi.pdfIn PDF document text
    • http://mevonnedobson.com/uploads/1/3/0/8/130814735/zubumofagorepe.pdfIn PDF document text
    • http://belesiscafe.com/uploads/1/3/1/8/131871817/46fa967.pdfIn PDF document text
    • http://fishingcountrynow.com/uploads/1/3/0/2/130291623/08f3d33.pdfIn PDF document text
    • http://minakayyalieventplanning.com/uploads/1/3/0/2/130273893/8490616.pdfIn PDF document text
    • http://screensondemand.com/uploads/1/3/0/5/130540065/xesobidul_bafutiwewaje.pdfIn PDF document text
    • http://simplyscottishancestry.com/uploads/1/3/1/6/131637395/marorujemesan-fuwifejumanuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE446 12384 bytes
SHA-256: fad9e14292184e84b2ab959a04f5b3b768b6ea4da92563dff1385349ec2470e3