Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdcd63f354a073b7…

MALICIOUS

PDF

81.8 KB Created: 2021-02-25 10:16:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ce2a9bd5352f841f8d0a3710df87ecd8 SHA-1: b8b371323a720b8b13b59c7b265b6e1b13b7e4cf SHA-256: bdcd63f354a073b7b7941865c9baba86704a5abb111307cb71e458570841ddf3
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'cat bite wounds' which is used to disguise the malicious intent. The presence of external URIs and link farm characteristics indicates a phishing or malware distribution attempt.

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://jottigo.ru/strik?utm_term=how+to+treat+cat+bite+wounds PDF link annotation
    • http://reduslimitaly-ufficiale.website/801157126v94bm.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/la_crosse_technology_bc700-cbp_alpha_power_battery_charger.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/kodak_eis_hd_1080p_manual.pdfIn PDF document text
    • http://dayzcommunity.info/kosofezanulonemklgk2.pdfIn PDF document text
    • https://popofexepazor.weebly.com/uploads/1/3/2/6/132680818/12ad8ed13e82b0b.pdfIn PDF document text
    • http://haifaiv.ru/bba_subjects_list85wd3.pdfIn PDF document text
    • http://design-kvartira.info/kiriazi_deep_freezer_manualvldyl.pdfIn PDF document text
    • http://titanof-filtr.ru/girogezini7txcb.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/649034798922s5i6.pdfIn PDF document text
    • http://thelandofbadideas.com/jidot9n0h6.pdfIn PDF document text
    • http://popapirim.22web.org/14577067204.pdfIn PDF document text
    • http://testertumentum.space/estudio_de_mecanica_de_suelosppzju.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/what_to_say_about_your_background_in_an_interview.pdfIn PDF document text
    • https://vinipuzi.weebly.com/uploads/1/3/0/7/130776781/gagij_vizemuli_rekudono.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://loxosufodu.epizy.com/94467322719.pdfIn PDF document text
    • http://giwofigu.epizy.com/how_to_uninstall_bloatware_android_6.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_off00010450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 5092 bytes
SHA-256: 756ba91aa32e72f635fa7d672bb8f45b86093363d905d1a2ad916ea6a7f2daef
font_01_sfnt_off000115b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B7 10676 bytes
SHA-256: f1ec743f71383e75c8066aeb299089b48ae4ed6ffd4ee2317800b50134bb13ff

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