Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c7eb8c4ec10f4b…

MALICIOUS

PDF

70.8 KB Created: 2021-03-21 04:03:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c6ef096743a91d9958846d04d8d283a9 SHA-1: 82e34925df6ac9fc4c8ae122afe9cbb5f1969709 SHA-256: e5c7eb8c4ec10f4bf89d38c301dd89f6436e4410f08660d51838a8ed85803d01
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for SEO manipulation or distributing malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external URIs suggests an attempt to redirect the user to malicious 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://leonvi.ru/wix?keyword=2015+ap+computer+science+multiple+choice PDF link annotation
    • http://tafakiduwav.scienceontheweb.net/duwasogetinapimixewopere.pdfIn PDF document text
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/velavujin_zuwoxune_fusixu_siminizalemado.pdfIn PDF document text
    • https://cdn.sqhk.co/xogovofofi/b6Cihjb/space_flight_simulator_mod_apk_download_android_1.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/astrology_birth_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/bujiwamovul/idehfhb/wiwavupu.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/QOD6gcH/blood_money_rapper_killer.pdfIn PDF document text
    • https://cdn.sqhk.co/gutemokerezo/BfihKgd/daxadibajifuzanij.pdfIn PDF document text
    • https://dofufegudi.weebly.com/uploads/1/3/1/3/131381881/laguvov.pdfIn PDF document text
    • http://kaxiwemusemoj.mypressonline.com/lepefazif.pdfIn PDF document text
    • http://tamakedesununod.mywebcommunity.org/bendable_concrete_seminar.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/lMhhUhb/awesome_words_that_start_with_s.pdfIn PDF document text
    • https://cdn.sqhk.co/worupageke/hjehafE/the_office_managers_after_michael.pdfIn PDF document text
    • https://cdn.sqhk.co/musezikuzapi/d9ijyjg/minix.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://jozobudesurarab.onlinewebshop.net/wusepu.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/ropipupusijafinalujave.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/grodno_azot_annual_report.pdfIn PDF document text
    • http://bototiluwoge.atwebpages.com/george_foreman_vs_muhammad_ali_record.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/67860691176.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/enlargement_worksheet_to_make_a_word.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_off0000cbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEE 5412 bytes
SHA-256: 55d9da354f9fec456ee78487193a4575c4965a4bdc1010474624cc51112a3eab
font_01_sfnt_off0000de0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0F 9792 bytes
SHA-256: 346a74d1f9aab7b7a5b234fc2d5ba1550fb4e68e9dd78ae5825c8a84c9c5bbc4
font_02_sfnt_off0000ffb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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