Malicious PDF — malware analysis report

Static analysis result for SHA-256 106aea7f0cb99bf4…

MALICIOUS

PDF

117.9 KB Created: 2021-04-08 09:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3a62185f6f521045d330409df08c8728 SHA-1: 88d55a990ecc2873bfa902032d58feb1125eb9b2 SHA-256: 106aea7f0cb99bf431c7061216b4a9451a29026d0907f8efae6ea1f0aa67cd24
136 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 as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' indicates the document is designed as a phishing lure, redirecting users to the URL 'https://mezovuduw.ru/wix?keyword=polaris+slt+750+parts'. The document body contains obfuscated text and metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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://mezovuduw.ru/wix?keyword=polaris+slt+750+parts PDF link annotation
    • http://finansi-7.online/how_to_clean_filter_on_frigidaire_dehumidifier_fad704dwdnt1st.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/iaPRihd/xanegevomoxala.pdfIn PDF document text
    • https://cdn.sqhk.co/ximosufi/hehbmFj/arcade_family_chromecast_games_ios.pdfIn PDF document text
    • http://walkover.me/how_to_become_an_animator_at_homejdcgg.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/fijdnjh/url_video_player_apk_ad_free.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/99c8643c-91ae-4d34-ad69-185a5518dd02/10834239220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b85ed383-3060-4bec-aa51-ce3fd99bd69a/vox_vt20_amp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1abaabd1-524a-460c-9be9-c01593587eef/vopugubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4895331-e2ec-4661-b7c7-bf1a3195885d/vw_car_service_melbourne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc07b765-980d-47e6-b45a-c7a7427ecb24/best_spanish_books_for_english_speakers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c784340e-6e02-476d-b517-2cc32589e1ff/nifijutokasagokutopofagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9de37d8-ba86-4641-a581-713b6de9e0e1/what_are_some_good_warm_up_exercises_for_basketball.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea018d62-543a-4894-9627-0f70e3d83d9a/donawulawin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cec721d8-c06a-4ce0-b7fc-70826dc40dba/what_is_the_catch_22_in_the_book_catch_22.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b6fa86a-4a36-498d-8029-2877cc6a528d/what_is_a_meta_analysis_vs_systematic_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b77ea21-6b4c-424b-97a6-48b9b22988f4/ti_84_plus_ce_or_ti_84_plus.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_off00019252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19252 5160 bytes
SHA-256: 3172d515b54588245d126189fc2654d3ff5d0ee99994642df842e758b84b96eb
font_01_sfnt_off0001a3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3F8 10984 bytes
SHA-256: a0bcd193a6cc6ac0fc2312b169fe789e4d7c7620a6439b90da5deac98513169f

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