Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c50bbb87a32161…

MALICIOUS

PDF

72.4 KB Created: 2021-03-23 02:26:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0eceed70ac30327482e5ae7c1a2bf969 SHA-1: 5b0be5683e2bdb11864a71664119c862a038260f SHA-256: 56c50bbb87a321614b6d7b736ce00da8953b65085d2ec050940bd938a238bda4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/strik?utm_term=d%2526d+doggie+delivery PDF link annotation
    • https://cdn.sqhk.co/tefaxobaf/ieUSggj/infamous_movie_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/felatadag/Agdkhcu/52797554856.pdfIn PDF document text
    • http://duwelizub.mywebcommunity.org/calmer_easier_happier_parenting.pdfIn PDF document text
    • http://xunarepozufuz.mygamesonline.org/teenage_story_books.pdfIn PDF document text
    • https://cdn.sqhk.co/mobobelelu/fDDeRji/badland_brawl_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/gijimexuv/hNI6Fjh/supermarket_city_farming_game_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/cDOYhbY/61174683271.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_88f410ded62c42549cb8e1c64d2f1d5e.pdf?index=trueIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_8f991b6c0b50411a9e9aad1eec3d180d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe33f5d7-99ae-4c3e-ba32-48fbac59b102/60220383096.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/pilgrim_progress_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/huanyang_vfd_inverter_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/how_to_install_a_kaba_lock.pdfIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_ac8a5b1eb2d347988e97874fb2698345.pdf?index=trueIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_582fe00babb34b2694db4da9fca6d120.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/52189045559.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/not_funny_didn_t_laugh_gif.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/anthem_medicare_advantage_ohio_prior_authorization_forms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20de1244-b568-40d3-9fec-3130eb8caf51/87417255054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a0333ac-4733-49c5-8223-9e14cc058427/how_long_do_cochlear_implant_batteries_last.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_off0000e1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E1 4156 bytes
SHA-256: bb1702a9e9b617346157f9ea6f36cc14559c37d4a4a2cf683ebd57dce9d2c082
font_01_sfnt_off0000f010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF010 10812 bytes
SHA-256: ec6bfb70d4fe2c5525e83f85d5c5c7811eb916d4db6803ec8647fda8d9d1b59e

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