Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f8bd3689a50b07…

MALICIOUS

PDF

77.4 KB Created: 2021-03-20 11:07:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4c3d4ecbbef1fb50474edf3344465730 SHA-1: 7987cde91894e86d75def1faee8f1ff750a91b6a SHA-256: 80f8bd3689a50b0708dd8a3c92f53efde2b626178a5404bb0a354e5d0292cd3e
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external links, many of which are part of an SEO link farm designed to redirect users to potentially malicious content. The primary lure appears to be information about 'voidable contracts', directing users to a URL that includes UTM parameters, suggesting a tracking mechanism for a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://nipisod.ru/strik?utm_term=what+is+a+voidable+contract PDF link annotation
    • https://kujivorel.weebly.com/uploads/1/3/0/7/130776875/744d00a7b.pdfIn PDF document text
    • https://zirufijidure.weebly.com/uploads/1/3/5/3/135316647/3754206.pdfIn PDF document text
    • https://gabinabadebaxir.weebly.com/uploads/1/3/1/4/131408928/5f1e56e65fac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://munomofeduvuwe.rf.gd/making_your_own_wing_chun_dummy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/788f7178-367f-41b8-ab89-f8f17f3c7174/buzexibareruzenikux.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/polk_magnifi_mini_review.pdfIn PDF document text
    • http://fimaxopazeviv.rf.gd/cafe_del_rio_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/casio_mens_g-shock_dw9052-1bcg_black_resin_sport_watch.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/vibulezogud.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/9832156691.pdfIn PDF document text
    • http://votasaze.rf.gd/59702656322.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/faguzaxujajisiduvela.pdfIn PDF document text
    • http://kikebunubalexu.rf.gd/what_stories_start_with_once_upon_a_time.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/when_you_lose_your_food_stamp_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d4782c3-59a6-4828-9e00-42f413814046/98645378626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42590235-dc16-4300-8c36-19cba6db5a9b/69772707606.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_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 5240 bytes
SHA-256: e390a7db460e9a44dd876f650f7065ad9c781b5ec365ab3d0741690ea75be325
font_01_sfnt_off0001046a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046A 10740 bytes
SHA-256: d6d4618bfd32f6f1749de90b8416b7e9b00d3e3c7b369188957485750201cfb7

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