Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bbfb0965a5a6863…

MALICIOUS

PDF

89.8 KB Created: 2021-06-02 20:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: efd7cf9179c79e21b33eca1e51435acf SHA-1: dbe3124515badd7fe075c4b4bfba634317b7c6d6 SHA-256: 8bbfb0965a5a686304d3d9f734b838c6c22c7ed8d8df6c7a1948d07fc77bfb65
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/pbw?utm_term=trainz+2010+thomas+and+friends+download PDF link annotation
    • https://luwagibefex.weebly.com/uploads/1/3/5/9/135966535/1055518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413455/normal_605e1e76d6af9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373243/normal_5fde2ca6669d7.pdfIn PDF document text
    • https://forilulan.weebly.com/uploads/1/3/1/4/131408022/484817.pdfIn PDF document text
    • https://gajegewajutop.weebly.com/uploads/1/3/0/7/130739456/3144091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446170/normal_6018c0493354b.pdfIn PDF document text
    • https://rogebupapopax.weebly.com/uploads/1/3/0/7/130739826/7550491.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4463306/normal_60b1584a51d1d.pdfIn PDF document text
    • https://gefosutobova.weebly.com/uploads/1/3/4/6/134647182/1660870.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
    • http://felefejimax.pbworks.com/f/sony_playstation_5_console_restock_best_buy.pdfIn PDF document text
    • http://pajinap.pbworks.com/w/file/fetch/144507060/dedamujozipibor.pdfIn PDF document text
    • http://veniwusuj.pbworks.com/w/file/fetch/144492039/solving_rubiks_cube_3x3.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/reading_plus_level_k_answers_silver_wings.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/f/pokovuz.pdfIn PDF document text
    • http://barumena.pbworks.com/f/how_to_program_my_rca_universal_remote_to_my_panasonic_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8afd662a-fbc4-410b-b1c0-fda373a451c6/78844951217.pdfIn PDF document text
    • http://pokatufaxi.pbworks.com/w/file/fetch/144423543/vufelefazojor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb921381-e747-466c-ac1a-d7d22c81a477/7618020846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d8b4a91-56d1-4d59-8550-0519322ea270/kokowamevivoxuvipepezer.pdfIn PDF document text
    • http://togusan.pbworks.com/f/80958083535.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/f/86185250456.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_off00010c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8D 5352 bytes
SHA-256: 6ca5d23e147e5ba08ff8beaaa3b4c60a268ec1621f59e0b8bf7ed7de189f1386
font_01_sfnt_off00011ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA3 13536 bytes
SHA-256: 57107f80b5dbbcc27a774dc215e0b5531b406a93b3db6f6cd1cc6c6ef48fd29d
font_02_sfnt_off00014a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A30 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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