Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d6e6753d4ab0c7…

MALICIOUS

PDF

81.4 KB Created: 2021-03-07 17:14:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ecac06877e6de4940a899479852c535a SHA-1: aa1739ae0e825d9e674f77b3126714fb8f6bf985 SHA-256: 86d6e6753d4ab0c76e47d4348f5bdd24df7d5d5ee69177079591d4287a9ae4b8
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing indicating it redirects to known malicious infrastructure. The ML classifier and ClamAV also flagged it as malicious, specifically as a phishing trojan. The embedded URL points to a redirector designed to lure users into downloading what appears to be a legitimate document, but is instead a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=creating+nonfiction+a+guide+and+anthology+pdf In PDF document text
    • https://cdn.sqhk.co/jemitaso/jaduihJ/gojek_ojek_taxi_booking_delivery_and_payments.pdfIn PDF document text
    • https://cdn.sqhk.co/nusuguponu/u4iaij1/6720465203.pdfIn PDF document text
    • http://cardioactiveitalia.site/58941145128q8u8j.pdfIn PDF document text
    • http://pop-marketplace.ru/ansys_spaceclaim_2018_user_guidexvhhx.pdfIn PDF document text
    • https://cdn.sqhk.co/tobijoge/hdSicig/59475880510.pdfIn PDF document text
    • https://cdn.sqhk.co/muzexeragod/aijhbge/metals_exchange_sdn_bhd.pdfIn PDF document text
    • http://dusosax.66ghz.com/snack_bar_budapest_1988_full_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/sofuxizago/bvtAxTX/defense_zone_3_mission_6_hard.pdfIn PDF document text
    • http://futup.ru/bbc_mundo_coronavirus_chilepr2qe.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/bFH6Wbx/16721452427.pdfIn PDF document text
    • https://cdn.sqhk.co/segevenujuka/6uFhdix/f1_tv_roku_mexico.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/davolazupivowi/how_to_replace_rv_furnace.pdfIn PDF document text
    • http://suzoduw.rf.gd/95511597581.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/4363558198.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/32946426719.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/aspirin_guidelines_diabetes_type_1.pdfIn PDF document text
    • http://nibudikugi.epizy.com/paguxizenugerofagaxojopox.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/udemy_app_canceled.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/didiboguxoponexuna.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/heavy_bag_stand_with_speed_bag_platform.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 5244 bytes
SHA-256: 72076df596d28ea43c5f25a27703576157cde59ffbdef9c080171396af0f5332
font_01_sfnt_off00010761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10761 10080 bytes
SHA-256: dcfeb1e7b7d68dd6ec5313039460cc129236fd20cb23d5f51d2066772706bc3f
font_02_sfnt_off000129f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F1 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71