Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea5e8576fd35f31…

MALICIOUS

PDF

77.8 KB Created: 2021-04-01 08:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: daf823646aa2fc38905b8664f7420e82 SHA-1: 796f90d18b3bb3ff3f5bf13b8fed825ccf5d7cdf SHA-256: aea5e8576fd35f3165a4b059770c456e1f40a46a467ca3b5a5e5ce29c0681e29
186 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many hosted on disposable domains or using URL shorteners, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the PDF structure itself is used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=why+won%2527t+my+lg+smart+tv+connect+to+internet PDF link annotation
    • https://cdn.sqhk.co/gizetinediz/a9ljcIm/zagumoraxakero.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/pdf_to_excel_converter_online_100_pagesvqbqv.pdfIn PDF document text
    • https://mofagobebaz.weebly.com/uploads/1/3/4/6/134633285/manetiwulide.pdfIn PDF document text
    • https://cdn.sqhk.co/gezefesete/zR50ifn/rekotazubowiga.pdfIn PDF document text
    • http://nikaold.site/woxixumitapufisazeruliy4nco.pdfIn PDF document text
    • http://xtreme-sport.ru/129655703494w3js.pdfIn PDF document text
    • https://cdn.sqhk.co/tilesoxeg/fgggMps/dell_latitude_e6410_specs_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/4JXijgg/2nd_grade_lesson_on_prepositions.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/dTgg8d9/tilolowagomowinid.pdfIn PDF document text
    • https://ravijirigiraga.weebly.com/uploads/1/3/4/6/134649302/zikifewerar_vamajo_goramelufix.pdfIn PDF document text
    • https://cdn.sqhk.co/kikepedu/hibidhe/desuvudadifutira.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/huhidib/kekagetaxubimunezupatu.pdfIn PDF document text
    • https://cdn.sqhk.co/finelega/Yjbjaej/passport_photo_id_studio.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/Tjiibnm/zetewuwolex.pdfIn PDF document text
    • https://lugumeduzox.weebly.com/uploads/1/3/0/7/130740149/75d5981ee33.pdfIn PDF document text
    • https://cdn.sqhk.co/lonubugogere/V6licbq/find_the_differences_the_detective_free_download.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://serobamemesazan.rf.gd/90652384157.pdfIn PDF document text
    • http://xapimiwosusuv.epizy.com/nojaw.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_off0000e454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE454 5304 bytes
SHA-256: 49286ba9b4ee5b6c1f2038e791b144b1f598591c4b927aaa43cd02cffa3be098
font_01_sfnt_off0000f64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64A 10312 bytes
SHA-256: 07b8bea02935a63492daaea9c11afa2fee3373ea882a2c438f965f31809c31b6
font_02_sfnt_off00011988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11988 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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