Malicious PDF — malware analysis report

Static analysis result for SHA-256 15bdab5af15baed1…

MALICIOUS

PDF

75.8 KB Created: 2021-03-07 09:11:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f88f6e8dc49fe686a024184b5c9f251e SHA-1: 0fe9a1a6d0b7c56740e91397df552dc538ca7f5c SHA-256: 15bdab5af15baed1a3337ab0fece19fa9dec882463de1ebd040410867c8d0f53
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to disposable domains and are associated with link farm heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/strik?utm_term=jack+reacher+3+trailer PDF link annotation
    • http://sijubuwejipamun.mywebcommunity.org/26626349025.pdfIn PDF document text
    • http://xebubux.sportsontheweb.net/is_little_fires_everywhere_only_on_hulu.pdfIn PDF document text
    • https://vumirexow.weebly.com/uploads/1/3/2/7/132740730/fabixisanof.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/echo_srm_230_brush_cutter_kit.pdfIn PDF document text
    • https://vidapuromojesa.weebly.com/uploads/1/3/4/8/134890941/1195751.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://posijibanif.epizy.com/ximevifuvuwevidaviwidid.pdfIn PDF document text
    • http://dezizogumeb.epizy.com/31656908069.pdfIn PDF document text
    • http://bixodog.rf.gd/28160848256.pdfIn PDF document text
    • http://zinimivozu.rf.gd/what_does_the_term_estate_mean.pdfIn PDF document text
    • http://sopexalibip.onlinewebshop.net/eureka_whirlwind_lite_4388_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/21521511598.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/21704258089.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/audio_video_cutter_and_joiner.pdfIn PDF document text
    • http://duwemanuwixam.atwebpages.com/naming_ionic_compounds_chemistry_if8766_answers.pdfIn PDF document text
    • http://sodowurivav.onlinewebshop.net/google_driving_directions_to_multiple_locations.pdfIn PDF document text
    • http://pewavifasovifuz.epizy.com/pokemon_backpack_playset_amazon.pdfIn PDF document text
    • http://figedid.rf.gd/afari_afari_video_song.pdfIn PDF document text
    • http://zaxigadanu.rf.gd/statistical_data_collection.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_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 4496 bytes
SHA-256: 569e22485085b5f024934ff2fbe5b0e2635338ff68a4f590485e17f55b4f9c67
font_01_sfnt_off0000ef96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 11188 bytes
SHA-256: c71d7008c05712f697758804388c7b3a707e0cbb054bc249ea122e0c779a1497
font_02_sfnt_off000113fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FD 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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