Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18ff40197ca5332…

MALICIOUS

PDF

77.1 KB Created: 2021-05-12 15:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 16778b946b0c076c30dd20db5de53d4a SHA-1: 302e08bd26dcf8f9cab7dd17a0c00168452ec8ea SHA-256: f18ff40197ca5332e8ac0aa0472656b5ed1717c34befe8cd514a47044832466a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URI pointing to 'dafemum.ru', which is flagged as suspicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a malicious intent to redirect users. Although no scripts were explicitly extracted, the PDF structure and embedded URI strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=untamed+house+of+night+book PDF link annotation
    • https://cdn.sqhk.co/levowexesu/dja3ibV/60764971703.pdfIn PDF document text
    • https://kipigifusulip.weebly.com/uploads/1/3/4/4/134437712/e66b83.pdfIn PDF document text
    • https://tisizapotiw.weebly.com/uploads/1/3/0/7/130776245/vitemuso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413703/normal_6033452766b8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401558/normal_60676168a2162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450038/normal_5fd5f788336f7.pdfIn PDF document text
    • https://murunabijijot.weebly.com/uploads/1/3/5/4/135401069/092aad755234e.pdfIn PDF document text
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/3aa977784748.pdfIn PDF document text
    • https://bafonalilazuxi.weebly.com/uploads/1/3/4/7/134731076/saxizewisosusav.pdfIn PDF document text
    • https://kovorugoza.weebly.com/uploads/1/3/1/3/131383314/f139de7553cdd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413980/normal_604a916177a5c.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/gfhaKGU/colored_pencil_picker_the_ultimate_drawing_tool_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/095e56fd-fde9-49fb-9317-380748e19303/rimas_y_leyendas_gustavo_adolfo_becquer_sinopsis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e482982-939e-4ebf-88ee-55ddb3f420f5/dungeon_and_dragons_premade_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/ice_breakers_questions_for_team_meetings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba948a2d-f813-4595-8528-8a65a7b394b2/human_trafficking_statistics_2019_by_state.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/kumoduxunadani.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/how_to_connect_my_bose_subwoofer_to_my_soundbar.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/reticular_formation_medulla.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/anime_tagalog_dubbed_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d93f071-8809-4957-a6ac-2b8b523dc99a/69394576281.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_off0000ece0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 5388 bytes
SHA-256: db93969fbfd68e6e64879af9a05587982b01362c83a71597bc215772c28411bb
font_01_sfnt_off0000ff15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF15 11680 bytes
SHA-256: ce07539e5f6d10acc2f31a912dfc239d2624b9eb06da1153720fa0496b9cc877

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