Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4bffacf7027ce62…

MALICIOUS

PDF

87.8 KB Created: 2021-03-15 09:45:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 45cbedd9b5b6875fa0bbfbdf57f1a598 SHA-1: 845c94df69bc4be7e49f7ea04fb218e98e40b68a SHA-256: d4bffacf7027ce62a23ae7bfed2f29fad174c13e3818509a922f4c2ffcb3c091
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous external PDF links, likely intended for SEO manipulation or to host malicious content. The primary URL, 'https://xezojetit.ru/wix?keyword=nj+transit+bus+pass', suggests a phishing lure related to transit passes. No scripts were extracted, but the PDF structure and embedded links indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://xezojetit.ru/wix?keyword=nj+transit+bus+pass PDF link annotation
    • https://cdn.sqhk.co/luwivimexu/lji7bMA/35844834927.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373261/normal_5ff98344dd39b.pdfIn PDF document text
    • https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/raboze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451045/normal_6018d9446b78b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_60124f639063a.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/ihhhjFQ/shadow_battle_2._2_hack_apk.pdfIn PDF document text
    • https://sibitolifi.weebly.com/uploads/1/3/4/7/134732274/9d8e85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475987/normal_5ffd475308bbf.pdfIn PDF document text
    • https://zipemulobob.weebly.com/uploads/1/3/4/5/134528333/8484176.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
    • https://uploads.strikinglycdn.com/files/f05f72a0-6880-4eb9-860c-06c8cd179f08/how_to_make_homemade_grape_wine_easy.pdfIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_c3b1d0997d0a4161b2675be234a1bbf5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0806c2d-316c-411c-950c-0e35fc0af39f/kolixogixemisorizuligawag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb9caec6-1a01-4f2e-b666-1a8aa419e349/90700701650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d06617a-7fbd-474c-adc0-d894a397b44d/platos_apology_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4bf2a3a-8a39-435c-95e5-eb67b6628622/83609858422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a017b47e-35ea-42fa-8dcf-01eeb31b6649/cateye_velo_plus_wireless_review.pdfIn PDF document text
    • https://dc2d7a30-bfa2-4f34-99eb-4654f170524d.filesusr.com/ugd/165585_73cd4811cc784002bc36070ed1876ed2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe2e0d20-9e3a-4934-8fb5-dba2538d2f36/multiplication_and_division_of_fractions_worksheets_grade_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42e8b0b9-cbf6-46ad-ade5-3a22702f82a2/panchatantra_stories_in_hindi.pdfIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_861f4ec091684c759d4de9c13f263190.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73D 4620 bytes
SHA-256: 661304574ee55a68ddf0024370ac3661a55867b693d92bdb348ea80c40e02241
font_01_sfnt_off0000f6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 5300 bytes
SHA-256: 82c6ce55227c5921b9fc0c07e37fd0bd463b553576c5e8182ca2fae5e654be82
font_02_sfnt_off0001058d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058D 11692 bytes
SHA-256: 07e16d3a587a70ea373acc37373da24943ec3d4a65f17fe8caa91cdbc6fe09c0
font_03_sfnt_off00012d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D79 16392 bytes
SHA-256: 58b3edc3ad296fcfcc78344e7a6db2a9b10f92e46d266322391e04b810943ba5
font_04_sfnt_off00014318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14318 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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