Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf208052e799333…

MALICIOUS

PDF

71.9 KB Created: 2021-03-12 21:55:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4583f5562bf0a316a9824d420bcfc3c6 SHA-1: c912771f9d403016dfc52beea06c4f6c3be86ca7 SHA-256: cdf208052e799333f8cf053d3e47dfeb5d2f4086b32dba08e28fda103e24153c
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-severity rule for an SEO redirector link, indicating a phishing attempt. The ML classifier and ClamAV also identified it as malicious. The embedded URL leads to a redirector, likely intended to deliver a malicious payload or phish for credentials.

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://leonvi.ru/123?utm_term=using+personification+worksheet+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4496013/normal_5fcc54654ee42.pdfIn PDF document text
    • http://baugroup.info/390121624124zrg4.pdfIn PDF document text
    • http://insuranceautousa.com/how_to_reset_a_vizio_sound_bar_remote24kn2.pdfIn PDF document text
    • http://vijasoga.22web.org/angular_format_phone_number_input.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426423/normal_60119f2003be6.pdfIn PDF document text
    • http://karaulovlife.site/nisoxokozidajiv7kjy.pdfIn PDF document text
    • http://japancar-sib.ru/red_harvester_ant_nestsifm4.pdfIn PDF document text
    • http://instasale.company/how_to_reset_a_kwikset_digital_lockwoq6q.pdfIn PDF document text
    • http://help-copyrighteamservice.com/buselipitisesozowevujagdf06j.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/mikibetiv/commercial_lease_termination_letter_to_landlord_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/nulavujeto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62cdac0b-3cec-419f-adab-3410bfce30a8/activate_windows_10_pro_product_key_free_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/tewuvoz.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/application_form_for_temporary_passport_kenya.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75fe5499-ef53-49a7-a7a4-71d24118009b/misijul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e65f376-91c4-4ebf-899b-c1c5947d024e/how_to_clear_acne_marks_at_home.pdfIn PDF document text
    • http://vonanovab.epizy.com/500_adjetivos_mais_usados_em_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/android_emulator_pc_snapchat.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_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 5392 bytes
SHA-256: 051dab65f689884a7fa88b2dbbfb8ae392e3a626e29b402ece69f981b867edf3
font_01_sfnt_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 10236 bytes
SHA-256: 69243fc0aebb39244ddeff2c6e4480c4653da90c4d06100456975ecd027548b7

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