Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ff68c86f5c4440…

MALICIOUS

PDF

112.7 KB Created: 2021-02-17 07:34:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 14e6c418c2e7768da08f57d21b02b00d SHA-1: b620a31f725a3505cd40d84069d915c7787fae6d SHA-256: 86ff68c86f5c4440a5fb5910025c3d83bb27e77a9fed1975011034f475dc6b4f
236 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to what appears to be an SEO link farm designed to distribute malicious content. The document body mentions 'Netgear router wnr3500u/wnr3500l', suggesting a lure to trick users into downloading a fake manual or related document. The presence of ClamAV detection and ML classification strongly indicates malicious intent, likely to deliver a phishing payload or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://maypoin.ru/123?utm_term=netgear+router+wnr3500u%252Fwnr3500l PDF link annotation
    • https://cdn.sqhk.co/jigitovewuk/hgiykic/lupadadaxozukudud.pdfIn PDF document text
    • https://cdn.sqhk.co/lazuxorus/GgeicqM/nagaxaravufejilozavuronez.pdfIn PDF document text
    • https://cdn.sqhk.co/gatavazer/aZwZja0/vetup.pdfIn PDF document text
    • https://rawoxozuk.weebly.com/uploads/1/3/2/6/132695352/de1479.pdfIn PDF document text
    • https://levalezekavazif.weebly.com/uploads/1/3/4/6/134639406/belujeka-tatesopa-zelivupevak.pdfIn PDF document text
    • http://construt.site/gafavatuvukccp14.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/digPicF/26844147860.pdfIn PDF document text
    • https://laxivaxof.weebly.com/uploads/1/3/0/8/130874385/pemubufezipuxiwago.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/4EIjegg/history_channel_not_on_youtube_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/tojofelekob/cgdjbNB/12047788948.pdfIn PDF document text
    • https://telidububiz.weebly.com/uploads/1/3/1/4/131452987/2437792.pdfIn PDF document text
    • https://cdn.sqhk.co/vexagajezesa/jjuNEYi/drive_by_exploit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/patilawasu/management_accounting_system.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/27310146333.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/bepajasovunorula.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/best_flight_tracker_app_android_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/crp_blood_test_report.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/double_cheesy_gordita_crunch_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/boxer_320_service_manual.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_off00017883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17883 5200 bytes
SHA-256: ea3978914d1673b044dd8ed2c9139dfe9a194d939a111fcd8a05de6b7453993c
font_01_sfnt_off00018a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A6C 13172 bytes
SHA-256: 59f02f881c21a8bb56b815b0aa06222563d06217a6b404806538160bcdacf72a

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