Malicious PDF — malware analysis report

Static analysis result for SHA-256 844154cfeb4d80d4…

MALICIOUS

PDF

71.2 KB Created: 2021-05-02 08:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d6f1e5a0a9752e1c349f6333d182fbd4 SHA-1: 58167839b43d6775fe61c12cc591933e9fff70d6 SHA-256: 844154cfeb4d80d476f211d669aa0e25bc9c1f3301bf03ef519cd64eb2a8d2fd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/strik?utm_term=bassett+convertible+crib+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389794/normal_604cc7f250c40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372085/normal_60054b40cc8f8.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/dibobirewefoxenupasitiloj.pdfIn PDF document text
    • http://lazotub.mywebcommunity.org/cambridge_english_advanced_1_for_revised_exam_from_2020.pdfIn PDF document text
    • http://euroshopmn.space/spok_unication_pager_manualnjfya.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_606e8708e3832.pdfIn PDF document text
    • http://ridunculus.com/18900445337uykfk.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.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/zurovajij/how_to_treat_chilblains_on_toes_nhs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/536c0aaf-f97b-4ece-ba1c-b92f5538012a/dorian_gray_storyline.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/audio_booster_for_pc_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32d90278-c9ea-490a-85c4-0cb0179f73e0/how_to_cancel_hot_water_tank_rental.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6995d3e-3f64-4dc7-a71d-52bb5384d3e2/how_to_get_a_helicopter_in_gta_v_cheat_codes_pc.pdfIn PDF document text
    • http://reladefuxuna.onlinewebshop.net/80854328957.pdfIn PDF document text
    • http://wafinumufi.epizy.com/italian_renaissance_art_campbell.pdfIn PDF document text
    • http://fokogijisigife.epizy.com/treatment_of_exercise_induced_asthma_nice_guidelines.pdfIn PDF document text
    • http://waguxinev.rf.gd/tp_link_smart_plug_stopped_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cc90344-59d3-4921-a197-44596b866176/best_robot_vacuum_review_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/36226310648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05c99ef8-f60f-4d80-b59c-cf297f568dd7/kubuwodutiwite.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_off0000d9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 5040 bytes
SHA-256: 0f5698d76141ab92cd2d73b5df696a6ef24bd3def4ee2e2f1e539a12faea347b
font_01_sfnt_off0000eaef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 10788 bytes
SHA-256: cf58d25c8762b297f019bff2ec7abae0ba26456fdb3c4040e776ff07e14c64db

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