Malicious PDF — malware analysis report

Static analysis result for SHA-256 731cde50b3b8368c…

MALICIOUS

PDF

74.8 KB Created: 2021-05-03 05:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f40f00c5a0a477f60e2e91058c7adc10 SHA-1: edd398bc6715928339f3f243bcdc9f2fc53b7d71 SHA-256: 731cde50b3b8368c8dce0f877d87be6119d44faeb9b2fba058a8b46f1517d38b
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=hoover+floormate+deluxe+instructions PDF link annotation
    • http://xebubux.sportsontheweb.net/lettering_alphabet_styles.pdfIn PDF document text
    • http://businessmentality.com/carrie_a_estranha_filme_completo_dubladowp32l.pdfIn PDF document text
    • http://kukusorukabapoj.iblogger.org/accounting_for_management.pdfIn PDF document text
    • https://vedixoba.weebly.com/uploads/1/3/4/8/134864822/jebekavivetet.pdfIn PDF document text
    • http://fakaluwu.scienceontheweb.net/megovezafubul.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/85950192732.pdfIn PDF document text
    • http://zelopaqq.xyz/889575525122d6a6.pdfIn PDF document text
    • http://sodaapp.club/ozymandias_analysis_breaking_badrhhy1.pdfIn PDF document text
    • http://pebifakonek.sportsontheweb.net/writing_internships_summer_2021.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/problemas_sociales_en_el_adulto_mayor.pdfIn PDF document text
    • http://tipipunir.iblogger.org/work_attendance_register.pdfIn PDF document text
    • http://naxajogilelog.medianewsonline.com/jukutolifuf.pdfIn PDF document text
    • https://golagunowij.weebly.com/uploads/1/3/2/6/132695575/4429150.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tofilijewok.atwebpages.com/48396328645.pdfIn PDF document text
    • https://781b76d0-895c-4d4e-90f3-491762fad171.filesusr.com/ugd/894952_805b50314a034edea1322f53c0eb2258.pdf?index=trueIn PDF document text
    • http://rabatelekovufar.myartsonline.com/the_hindu_newspaper_english_download.pdfIn PDF document text
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_4ecc55c4afa842aab012d3e4c9850590.pdf?index=trueIn PDF document text
    • http://moxuzaridob.onlinewebshop.net/vobomuwejejoxavivonejafek.pdfIn PDF document text
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_b2f01ea3e9dc4e4f9466f81872b7c002.pdf?index=trueIn PDF document text
    • http://kimuwasozapuse.rf.gd/cpr_bls_manual.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_off0000e2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 5256 bytes
SHA-256: f8dde3e1ea57b1b21f38e9f11961ccbe5b50b38129066629626fd43dbe15c5c5
font_01_sfnt_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 12208 bytes
SHA-256: 5d71e7c9ef6bb123f7a9f69f9b7fd92bb8fa6568da62afa66b61552a76ad128b

Open this report in the interactive analyzer, or submit your own file for analysis.