Malicious PDF — malware analysis report

Static analysis result for SHA-256 f838608eef2c4c1c…

MALICIOUS

PDF

77.0 KB Created: 2021-04-17 00:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8d766936089ba532299bd418bc9c74eb SHA-1: f52056211404e08512cb1211a5bf2e9e0baf0e62 SHA-256: f838608eef2c4c1c44eb05dc987fabff7b7af4e070505293760ee4b1151dd537
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 0.9997

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
  • 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://dugedepap.ru/strik?utm_term=baptism+of+fire+chapter+summary PDF link annotation
    • http://nituzovido.getenjoyment.net/prokaryotic_cell_structure.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/applications_of_machine_learning_in_cyber_security.pdfIn PDF document text
    • http://farozemirig.scienceontheweb.net/applied_behavior_analysis_second_edition.pdfIn PDF document text
    • http://mizizufiku.mywebcommunity.org/fisodagoregopolin.pdfIn PDF document text
    • https://cdn.sqhk.co/remigalakefo/61mhiZI/16218666078.pdfIn PDF document text
    • https://cdn.sqhk.co/susorajin/fhbqcRr/22104369142.pdfIn PDF document text
    • https://cdn.sqhk.co/zatugudaxaji/Bi9iigE/figimunuzobomupas.pdfIn PDF document text
    • https://cdn.sqhk.co/titesojijuko/chj9ehf/build_a_bear_baby_yoda_sounds.pdfIn PDF document text
    • https://cdn.sqhk.co/vikeguzag/idY7ieS/jijurijitodisobowiguj.pdfIn PDF document text
    • http://japamawosoj.mygamesonline.org/waterfall_model_phases.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_b00b7de377964426a32682bcfe3ef7de.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/adaraya_agamaki_full_hd_video.pdfIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_e7c3ca74beae4458852772499728c7f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d458070-6fa6-499f-97b2-011cf26027bb/que_hace_a_un_lider_daniel_goleman_mapa_conceptual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7769951a-20da-4ad2-b8bc-7ff633f803d0/81268636228.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/5863071034.pdfIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_e36625316ea34a1fbc0d0aeaac1f0960.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/voropa/90235513914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3c2611e-e56e-42c2-8d51-2ab8ac714d38/singer_20u33_parts_list.pdfIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_991dfebf2a594d3ea3b3244577972dee.pdf?index=trueIn 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_off0000ed46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 5372 bytes
SHA-256: 49de14721ed34bcc7aa89244aca3ad5297c9c003e42bb038644e05a77fea1780
font_01_sfnt_off0000ff6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6D 11136 bytes
SHA-256: a6c430736b4db43a6435d1d15cef5a690e64ded3aaa5a1fea6d7b389638a64be

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