Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4390aa693faf50…

MALICIOUS

PDF

78.0 KB Created: 2021-02-28 17:04:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d5694427f7fdc1e98a30a3083ae1434c SHA-1: 0e2bbfc5f9205e10b5b9568ea6cdd2f5f940f2a5 SHA-256: 8b4390aa693faf50a0e9b33ecd58aa596c21fd13ccbb86670113f86b7bc8bab6
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 SEO redirector to disguise the malicious intent. The primary URL, 'https://dugedepap.ru/123?utm_term=example+of+qualitative+research+proposal+abstract', is associated with this redirector, suggesting the document aims to trick users into downloading further malicious content. ClamAV detection and ML classification further confirm its malicious nature.

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
  • 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://dugedepap.ru/123?utm_term=example+of+qualitative+research+proposal+abstract PDF link annotation
    • http://playmarket-online.com/gizoromaguktxc9.pdfIn PDF document text
    • https://cdn.sqhk.co/bodorosuzuta/0Oifijg/cheap_fishing_tours_near_me.pdfIn PDF document text
    • http://frankiearvelo.com/pulumumoruzozomizizilupaswqv2s.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/nwgeuia/45853937975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383574/normal_602c85754b821.pdfIn PDF document text
    • http://kompledom.com/bose_soundlink_mini_user_manualdigju.pdfIn PDF document text
    • http://gelchlen.fun/vefijumamugivenarogomavw3wb.pdfIn PDF document text
    • https://cdn.sqhk.co/milevatomog/AihWIgf/tomabidimuvokepurubig.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/hj2jbji/train_speed_control_system.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/jujadodedaruxix/conversation_question_answer_for_class_6.pdfIn PDF document text
    • http://vozovowu.rf.gd/55612750486.pdfIn PDF document text
    • http://tusepubenawipad.rf.gd/53900829875.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/laminator_sheets_kmart.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/johnny_appleseed_worksheets_free.pdfIn PDF document text
    • http://rakulewozagax.rf.gd/18694871324.pdfIn PDF document text
    • http://keguwizidolubo.rf.gd/skyui_error_code_1_steam.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/40862421712.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_off0000f45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45E 5604 bytes
SHA-256: e5b4d687a79cb2ce7635a62011f17cda297aedd44f6ecd778b0c5412d138a662
font_01_sfnt_off00010755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10755 10476 bytes
SHA-256: 8cae3f346b00f6c630676c39ea9c4cdc7337452bd3805b77c29f8e04f916b8c9

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