Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfdb721584a72994…

MALICIOUS

PDF

105.1 KB Created: 2021-04-05 13:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b264202cb257a6c0a224e35bb22704a7 SHA-1: bbcc7bfbf8f4134bc392e604012db8dc5618fb48 SHA-256: dfdb721584a729946e60afa6843e9765cf2bd70f4305391fe256d847171e866d
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it's a phishing lure, specifically using an image related to 'zero turn mowers' to entice clicks. The primary malicious URL identified is https://midufefew.ru/strik?utm_term=what+is+the+best+zero+turn+mower+on+the+market, which is flagged as an external URI and a redirector. The ML classifier and ClamAV also strongly indicate maliciousness, consistent with a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://midufefew.ru/strik?utm_term=what+is+the+best+zero+turn+mower+on+the+market PDF link annotation
    • http://purpless.vip/9089658928pjk0p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460983/normal_6001802e0f01a.pdfIn PDF document text
    • http://trujillostacoshop.com/baseband_transmissionsnwen.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/how_to_make_togahrcua.pdfIn PDF document text
    • https://cdn.sqhk.co/zixajofazadi/agihfib/free_fire_hd_wallpaper_1920x1080.pdfIn PDF document text
    • http://ergors.space/how_to_read_linear_bplvsp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490949/normal_5fd0df7706e43.pdfIn PDF document text
    • https://cdn.sqhk.co/loxinesupiva/ygegfZr/bluetooth_car_diagnostic_scanner_amazon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fafff077-4102-4ebd-8104-755aeedd4ea9/38973975652.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/xedimavimon.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/places_that_fix_washing_machines_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/what_is_the_best_version_of_python_to_use.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/luromikixubupufesom.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/59559039995.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/5368704727.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61a4c3fd-c96b-4bf6-9138-48b278cad6d6/sevepoxaxidojov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff22f659-42e0-4312-97e1-d35026a9a8f6/17589268409.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAC 5252 bytes
SHA-256: 6c3cf5c40c7660f290680f15d31023ece6fecbbf9c765aeb19d778846c927457
font_01_sfnt_off00015d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D7B 10712 bytes
SHA-256: 18360d7f2f55c0f81fb9779506400202ef46c4ca4bc82e811e491be8ca108e97
font_02_sfnt_off00018221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18221 16076 bytes
SHA-256: be99eec5252a5aa651cecf07e99d86bba1df1129d84d8f44bf692ed59b17da34

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