Malicious PDF — malware analysis report

Static analysis result for SHA-256 212cec0d9531a051…

MALICIOUS

PDF

80.7 KB Created: 2021-04-03 06:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5791d13b5e04a4fa53be89e33f42b1e6 SHA-1: 7c505b2628ab80aa5989ba1a6dc8308c5a5e8089 SHA-256: 212cec0d9531a05168674c0232684464d9e220991e87d83f3d4390d22308e626
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'botokaw.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'French alphabet pronunciation chart' and 'wkhtmltopdf', which appears to be a lure to disguise the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=french+alphabet+pronunciation+chart PDF link annotation
    • http://fakurivevid.scienceontheweb.net/lozokokipapurebafitojij.pdfIn PDF document text
    • http://detonic-ro.website/nubomumurifaxojepu2z5s8.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/tokopixotapajudodadifi.pdfIn PDF document text
    • http://wopexobow.mywebcommunity.org/45541983444.pdfIn PDF document text
    • http://pelistens.xyz/30060619078vexwy.pdfIn PDF document text
    • http://bitalotava.scienceontheweb.net/burda_stricken_download.pdfIn PDF document text
    • http://lightly.store/sura_yasin_bangla_translation_download5pprb.pdfIn PDF document text
    • http://rowexusaje.mypressonline.com/anemia_ferropenica_fisiopatologia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuzunura.rf.gd/83597685236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f08f4771-211c-4660-b000-166c68c5f477/iceberg_slim_pimp_glossary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81daa19a-b758-4218-a2d6-8bf8d4bd9612/zaributesipavizixifokixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b3a5703-50eb-4133-b4d3-34abe160bacf/41286653560.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/badger_100_garbage_disposal_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/26379279696.pdfIn PDF document text
    • http://rixoxufutafugi.rf.gd/coordinate_geometry_formulas_list.pdfIn PDF document text
    • http://xobebol.onlinewebshop.net/capsule_staining.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/29438160342.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_off0000f688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF688 4936 bytes
SHA-256: 105447f124200f2579c339f4f1425a77adce492e954afa3238545912943b59f6
font_01_sfnt_off00010746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10746 15388 bytes
SHA-256: f447408d6f7075dac06cc728762bc22baaba41f8d0a9fe33cf0cd33dd73ac729

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