Malicious PDF — malware analysis report

Static analysis result for SHA-256 4871249c75de79e2…

MALICIOUS

PDF

77.5 KB Created: 2021-03-22 05:23:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6c74c954aec9f189f018314f874af54b SHA-1: 4c2af3b9e447f0655e95f3a596cfd7ed6acf479f SHA-256: 4871249c75de79e26d55f6929c33d4a465e87c04ead7157c3b754584543df98f
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure ('dafemum.ru'). The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to the embedded links, suggesting a lure to external 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/wix?keyword=mersey+river+chalets In PDF document text
    • http://simopuvoramawu.mywebcommunity.org/29960764644.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/fjbijge/buddypoke_app_download.pdfIn PDF document text
    • http://tuforuj.mypressonline.com/najaraniletakuropodom.pdfIn PDF document text
    • https://cdn.sqhk.co/pavupaken/UUpgyhi/descarga_epileptiforme_generalizada.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CDWhbqq/bamogapewinifusofenarilog.pdfIn PDF document text
    • http://com-signto5.xyz/4542639263apym4.pdfIn PDF document text
    • http://xofajenakimexo.iblogger.org/60559616082.pdfIn PDF document text
    • http://ital-tess.space/does_costco_have_computers849q8.pdfIn PDF document text
    • http://zoxenejuwu.iblogger.org/kozopobibuzotomaxinilitol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/jurnal_tentang_ascaris_lumbricoides.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1966d100-f718-4735-8558-a810dd4d6ce5/lumakurekibafug.pdfIn PDF document text
    • http://gikuxedikejoba.epizy.com/jafomexezagexat.pdfIn PDF document text
    • http://famuruvif.epizy.com/reading_and_writing_in_science_grade_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d60fb81-a832-459f-89ab-6496026c86e2/samsung_bd_p1600_user_manual.pdfIn PDF document text
    • http://fusizukokumov.epizy.com/asp.net_mvc_selectlist_set_selected_value.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07a12538-35cc-481a-9120-36603e42ccf2/nopoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31c9d0be-28fa-4b3f-bd71-042f8b48d9b1/11013279931.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/clash_hero_s3.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/netese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/816c7bd1-0416-4481-bddb-32b39847ebd5/tupise.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_off0000f090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 5056 bytes
SHA-256: a9c496f15e879511785a7099758f29d2aeb7d871ccb41b5037e9df25b66a2d98
font_01_sfnt_off000101d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D4 11512 bytes
SHA-256: b87b24a9d9c9e97d64945ed1609272fc077bb34c8429565181c2441048e4bc01

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