Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e56c8a0037adeb3…

MALICIOUS

PDF

71.7 KB Created: 2021-03-20 09:41:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 39b3288904e0d0d24032b62a6ed8be1e SHA-1: 71ceaefaf99db05af64a867b8008a249a8e59005 SHA-256: 6e56c8a0037adeb388a949bc2accf04dc2764b46db4a4ac83551f3017ce38eed
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://dafemum.ru/123?utm_term=parse+error+opening+apk PDF link annotation
    • http://gijaninapumobe.sportsontheweb.net/aperture_and_shutter_speed_chart.pdfIn PDF document text
    • http://sodahq.pro/2856525445t6aes.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/j0iijdo/zezujibuzesubanamajimi.pdfIn PDF document text
    • http://sobakin.space/23083427868hck0q.pdfIn PDF document text
    • https://cdn.sqhk.co/reruzemafow/giTAUNN/pijukevunirilil.pdfIn PDF document text
    • http://item-mask.top/software_development_engineer_salary1ne82.pdfIn PDF document text
    • http://skidki-day.site/87029451831vhamz.pdfIn PDF document text
    • http://rubyshup.space/vipomalzg9p0.pdfIn PDF document text
    • https://cdn.sqhk.co/wupetutigo/hgbjfif/kivatejadovevetajuzu.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/cxiifx2/ludifadolemorawovedofed.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/17523919905ieg03.pdfIn PDF document text
    • http://bigowet.xyz/denitozowolagiranivh4ttt.pdfIn PDF document text
    • http://paxijivatebul.getenjoyment.net/wordly_wise_3000_book_7_lesson_13.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/fgfoijj/wordscapes_level_15806.pdfIn PDF document text
    • http://carluxepaint.site/kawasapipiw6cxp3.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/CqzBpic/hidden_escape_lost_temple_walkthrough_chapter_5.pdfIn PDF document text
    • https://cdn.sqhk.co/solaxutom/vhghchb/rpg_maker_xp_games_on_android.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/dell_precision_m4700_webcam_driver.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/systematic_literature_review99moq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/journal_el_watan_alger_aujourd_hui.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_off0000dcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAA 5020 bytes
SHA-256: b460a986ac85a9d06be9941a6d25ea065d59ec654e156ccbaa7e808e1fca2499
font_01_sfnt_off0000edd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD5 10576 bytes
SHA-256: 2eb17d5089faa9e310de8a94037e92867b08f4398e7f1bdeee3287b9352ea912

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