Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5ef065e6082c83…

MALICIOUS

PDF

80.4 KB Created: 2021-03-13 12:48:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: bc5ac24529c4732b5000bf324110d359 SHA-1: 30124676582038e60139d115b8a0679812498055 SHA-256: df5ef065e6082c83bc9ef98f43f5bd5c5e84cd333685631a4dfe4e4f6dd0f092
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/aws?utm_term=how+to+maintain+a+dehumidifier PDF link annotation
    • https://talurepif.weebly.com/uploads/1/3/4/6/134603846/nesinowobasarowib.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/fKeWPR8/extreme_mountain_bike.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/CjjiDha/37928617546.pdfIn PDF document text
    • https://bemafaparad.weebly.com/uploads/1/3/2/6/132681832/1021823.pdfIn PDF document text
    • https://cdn.sqhk.co/tijatabov/cgQfmii/zombie_shooter_gun_target_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/duwenaxiseve/ciejchi/zombie_hunter_survive_the_undead_mod_apk.pdfIn PDF document text
    • https://wujadagepixiv.weebly.com/uploads/1/3/1/8/131856877/1480948.pdfIn PDF document text
    • https://donurufeto.weebly.com/uploads/1/3/4/8/134898164/dujisexilakupivano.pdfIn PDF document text
    • https://gavuwili.weebly.com/uploads/1/3/1/0/131070236/xenaturexelomewo.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/robumuduluwise/static_html_landing_page_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/bhojpuri_fim_bandhan_movie_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7924a351-ce04-4a88-8e19-8a9bfbaca3d2/oracle_sql_loader_tutorial_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82e7224c-73b7-4203-bd97-1453f20ca8ef/vebinoza.pdfIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_83d898b2a6e1474fb2476177ec4cd36f.pdf?index=trueIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_c1d1f8f394624c5abcb0f31df5624b5f.pdf?index=trueIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_6b40fedfd9124ad296672f06177a6178.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/biforme_ou_uniforme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/568577e2-292a-417c-95cc-bdc560b5ebb5/ratutupazirarezu.pdfIn PDF document text
    • http://sidunutisa.epizy.com/vesta_pro_font_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8cf08d3-f73d-4871-a080-704002e34620/xepepepagefasus.pdfIn PDF document text
    • http://vidifazitonigi.epizy.com/21035648619.pdfIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_0ed607539858409b8b16e9c5adc10b4a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lawakux/jazz_guitar_solo_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/99004694301.pdfIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_c4bd23513f5e416f82085f766fb704d1.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_off0000fdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 4988 bytes
SHA-256: 2ed6b335911a4154f6429ae0e3535787177ff8571980f9fea2e178d378e9e028
font_01_sfnt_off00010ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC6 11152 bytes
SHA-256: 7a87d6ca349c210cc45e034362e1c695817079839c08ff0f57f4d0c882681559

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