Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b69b69c2b338c83…

MALICIOUS

PDF

74.5 KB Created: 2021-03-06 15:16:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a7ed98d7a4a0a2ce7265f1f807c840a7 SHA-1: 9146a4ca029b9a1cdb90420d5b26164ed67d324a SHA-256: 5b69b69c2b338c835fa21084e6e1f05d4b6565882453de72b08617bb7c2e90f7
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. It contains a large number of external links, with a critical heuristic identifying it as a link farm. The ClamAV detection further supports its malicious classification as Pdf.Phishing.Trojan. The embedded URLs suggest an attempt to redirect users to potentially harmful sites, aligning with phishing or malware distribution tactics.

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 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.
  • 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://leonvi.ru/123?utm_term=the+betrayed+wife+book PDF link annotation
    • http://eu-study.ru/31589963396ljuqp.pdfIn PDF document text
    • https://cdn.sqhk.co/wejafivelij/diitxig/rolomiravenetowodef.pdfIn PDF document text
    • http://prizinsta365.website/8317646358yod0k.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/idt1Ggh/remixes_roblox_id.pdfIn PDF document text
    • https://jotovaxawunujej.weebly.com/uploads/1/3/1/8/131856347/5848590.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/ghhd9jh/74675154512.pdfIn PDF document text
    • https://gulukuse.weebly.com/uploads/1/3/2/7/132740430/62c6e4e.pdfIn PDF document text
    • http://formblckr1.xyz/ryobi_1700_psi_pressure_washer_replacement_partsvnwha.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/rujimidujek/mirik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef2df844-5a9d-4386-bcd2-47fba412f0cb/attack_on_titan_season_3_part_2_limited_edition_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b841d834-b95f-403a-887b-bab948218123/how_to_become_a_social_worker_assistant_in_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/federal_credit_report_free_annual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93de5086-89c5-465a-b90e-20282ea3ac1e/pride_and_prejudice_summary_chapter_14.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/78834365320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66c2c6d5-2d87-4f43-a060-b812cde17dfb/71787464055.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/sutajoten.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/58091043548.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/zomozevoligunigavivovoki.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/zixenifam.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/nujopawobik.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_off0000e6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E1 5132 bytes
SHA-256: ddd3443ff0933d2f87056e5407bd88c52ff2aaf5c190698940d8da0b1a990a75
font_01_sfnt_off0000f866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 10576 bytes
SHA-256: 4102f2eb994f7300c799a11ce9277c2d16d53f4aac748ce9b64844af6b0fb49a

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