Malicious PDF — malware analysis report

Static analysis result for SHA-256 8deab8e02828d33d…

MALICIOUS

PDF

69.7 KB Created: 2021-04-18 23:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e2eaf096839454d1f29b77693ffe2f35 SHA-1: 737338bef86957360fda7d762fec8f484c636d42 SHA-256: 8deab8e02828d33d9c0ff8e75f437e2bc7e7ad3eb1c518db1eb909254126296c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to link farms hosted on various domains, suggesting an attempt to obscure the final malicious destination. The document body, though partially corrupted, contains a title related to connecting a Swann DVR to Wi-Fi, likely a lure to encourage users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/povufukawonafano.pdf In PDF document text
    • https://aboss.by/sites/default/files/webform/12404161593.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/85138354947.pdfIn PDF document text
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/memirudomonejusowanasu.pdfIn PDF document text
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/tajiwugebewozebukak.pdfIn PDF document text
    • https://www.enwidth.com/sites/default/files/webform/resumes/89382212171.pdfIn PDF document text
    • https://www.mothercare.ro/sites/default/files/webform/resumes/jilagofuzepev.pdfIn PDF document text
    • http://oaklandchildcare.org/sites/default/files/webform/80411930416.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/zabufenopi.pdfIn PDF document text
    • http://portal-mysigma.com/system/files/student-proof/47432021317.pdfIn PDF document text
    • https://www.ofalloncasting.com/sites/default/files/webform/81254010544.pdfIn PDF document text
    • https://www.newburghgroup.com/sites/default/files/webform/resumes/mogewewe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+connect+my+swann+dvr+to+wifiPDF link annotation
    • https://umatter.princeton.edu/system/files/webform/requests/tutoturabawukaxubudevodor.pdfIn PDF document text
    • https://lib.asu.edu/system/files/webform/46247033309.pdfIn PDF document text
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/68876097481.pdfIn PDF document text
    • https://community.princeton.edu/system/files/webform/fivedexexefo.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26A 5352 bytes
SHA-256: 38dae82fa49639b70313fe02e5b7c47d024edff7cbe517e3d01420c03c4bf781
font_01_sfnt_off0000e4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A4 10832 bytes
SHA-256: 6366e65c485a990a22fbf8d21b2858e1d665e6e89cc26f98bb91c5fc97b6bbc2

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