Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef75c4afc5fe475c…

MALICIOUS

PDF

77.9 KB Created: 2021-02-16 06:48:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b06501aeb1a5307c9815180e20070cda SHA-1: af788441233b3249ce4835b84c6d829ca79be443 SHA-256: ef75c4afc5fe475c28eb49e54e6865ff5873b72ca68cb2d7f65a7814dd38d5b3
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on low-reputation hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wb?keyword=behind%20closed%20doors%20lyrics%20lana PDF link annotation
    • http://gabubixaj.22web.org/handwriting_practice_worksheets_for_grade_5.pdfIn PDF document text
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/0ef31f1a4e.pdfIn PDF document text
    • http://pewuzixuk.iblogger.org/barbie_doll_cake_game_karna_hai.pdfIn PDF document text
    • https://rubitolagaju.weebly.com/uploads/1/3/5/3/135330326/tebovidole.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/yjes9jc/fikimagexamopumuvodufimiv.pdfIn PDF document text
    • http://sajitalunaded.22web.org/27179966162.pdfIn PDF document text
    • https://vufosaxirit.weebly.com/uploads/1/3/4/0/134018891/f14f27085d.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/2846025.pdfIn PDF document text
    • https://damatabawapu.weebly.com/uploads/1/3/1/3/131379320/8e2ea3cb.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
    • http://bumumewevebav.epizy.com/44816846318.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/24282083766.pdfIn PDF document text
    • http://navebulaj.epizy.com/83656841418.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/gojomafolugoza.pdfIn PDF document text
    • http://sizatopus.rf.gd/grade_calculator_excel_spreadsheet.pdfIn PDF document text
    • http://vowafipefazasex.epizy.com/jutuxuladumed.pdfIn PDF document text
    • http://zaxowudupa.rf.gd/84310945307.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85F 4884 bytes
SHA-256: 3f6686a3f3dd56115391d30fa1139c44dc19b3068982f758b2e922e271233496
font_01_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 10368 bytes
SHA-256: 5e83a39d12a350514fc4dbd78b2286f94510bcf2ed75a832c0bb0c6ec790fc5a
font_02_sfnt_off00011c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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