Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dbd8f7e26fa0b56…

MALICIOUS

PDF

73.6 KB Created: 2021-03-14 09:29:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6d6b67c3516295aea50fe70696e49d77 SHA-1: ba3421f8e3d2f788135c14596bff4e2d9d04a47a SHA-256: 6dbd8f7e26fa0b568cb1b206d4dc05e55dfaee1841f824cc2a0a9bc6abed5d14
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded URLs pointing to potentially malicious domains, suggesting it's designed to redirect users to phishing or malware download sites. The document body, though heavily obfuscated, appears to be a lure related to a worksheet, aligning with common social engineering tactics.

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://jumiwimov.ru/strik?utm_term=perimeter+of+regular+polygons+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/febutatesu/whbhaf6/vopozidobo.pdfIn PDF document text
    • http://netewe5.xyz/computer_science_dictionary_free6ih5m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489042/normal_5fc63ac65e166.pdfIn PDF document text
    • https://widowajezow.weebly.com/uploads/1/3/4/5/134584852/nunaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490735/normal_601a99ad36ea0.pdfIn PDF document text
    • https://cdn.sqhk.co/vagofedewat/fjjfxQB/98911555219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493916/normal_5fd9966613032.pdfIn PDF document text
    • http://trysucre.pro/ana_gabriel_60_grandes_exitos_descargar0rbv2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380869/normal_5feec72f70949.pdfIn PDF document text
    • http://cloudplay.xyz/samsung_top_loading_washing_machine_repair_manualzxxdw.pdfIn PDF document text
    • http://helpcopyright-service.com/32720901113f8faf.pdfIn PDF document text
    • https://kuxilididid.weebly.com/uploads/1/3/4/3/134387830/sowagupopokipin_gawumibimutoga_foduxesifazag_gegevotanonavul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_604ce244e9963.pdfIn PDF document text
    • http://yozi.store/how_to_apply_for_pipefitters_unionqcmh9.pdfIn PDF document text
    • https://mijekonepe.weebly.com/uploads/1/3/2/8/132815105/f21ad2bbbe2265.pdfIn PDF document text
    • https://zefijevizo.weebly.com/uploads/1/3/2/3/132302816/9aa3aa7.pdfIn PDF document text
    • https://wibugosavuzatug.weebly.com/uploads/1/3/4/3/134349607/0a4558d75002679.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ritarajekaxitev.rf.gd/sniper_ultimate_kill_movie_download_in_hindi_filmyzilla.pdfIn PDF document text
    • http://jawegoxizifiti.epizy.com/76720036968.pdfIn PDF document text
    • http://furakazipekili.rf.gd/transformers_alternators_mirage.pdfIn PDF document text
    • http://nazewomufewe.rf.gd/4454001252.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_off0000e191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE191 5712 bytes
SHA-256: c577f5d99e25dbf3339f3e64ffb1a49f2ba966f0a7a748c59d472a286422cb28
font_01_sfnt_off0000f4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F5 10576 bytes
SHA-256: 80c2cede128301a96f34c7207e4e327c3823ac3a5419248091233ab92ea3843d

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