Malicious PDF — malware analysis report

Static analysis result for SHA-256 b34d6bb22b75b8ff…

MALICIOUS

PDF

75.9 KB Created: 2021-05-14 13:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 81441791cfa73544a766333e066a5ff9 SHA-1: 206bd8946a3576591b272a824732e4adccf4967a SHA-256: b34d6bb22b75b8ffb17a3ac3bc9ae1ef00b20f31030622ef32981dca5f2590c3
134 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, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this, indicating a lure to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/strik?utm_term=hp+laserjet+2100%252Fm%252Ftn+installation PDF link annotation
    • http://nuredalad.iblogger.org/65991495673.pdfIn PDF document text
    • http://fumerox.iblogger.org/arc_length_examples.pdfIn PDF document text
    • http://konexubevudo.iblogger.org/xosobamakegabux.pdfIn PDF document text
    • https://cdn.sqhk.co/kasavakujosi/iz4kage/pavosoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/xidodaxu/Y3Ohjgi/monkey_wrench_answers_sept_3.pdfIn PDF document text
    • http://jitokinut.iblogger.org/italian_renaissance_architecture.pdfIn PDF document text
    • http://godisibipuvam.22web.org/battlefield_3_pc_crack.pdfIn PDF document text
    • http://jidevutijosu.iblogger.org/how_to_calculate_the_reliability_coefficient.pdfIn PDF document text
    • http://dijemakipesozox.iblogger.org/64518925024.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/HEgfwhg/forgotten_hill_mementoes_order.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dodarululi.epizy.com/vanesunukupemerolewedaxo.pdfIn PDF document text
    • http://fetuteg.rf.gd/apoptosis_y_necrosis_celular.pdfIn PDF document text
    • http://katezoluvezile.epizy.com/mishima_guide_persona_5.pdfIn PDF document text
    • http://rusuxagek.rf.gd/46831030991.pdfIn PDF document text
    • http://dimaninerif.rf.gd/pevaxajalolovejunomevukix.pdfIn PDF document text
    • http://pirajog.epizy.com/wowilizagevuweto.pdfIn PDF document text
    • http://dutajorinegoxa.epizy.com/bhaktamar_stotra_kannada.pdfIn PDF document text
    • http://saxatizajug.epizy.com/linux_render_html_to.pdfIn PDF document text
    • http://gajumelixidolob.epizy.com/nupowuwininutox.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_off0000e9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B4 5364 bytes
SHA-256: 1e475b78170472cc9fecececa9232b468dcab3035c058cfb8c0516164fb0e2e3
font_01_sfnt_off0000fbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 11336 bytes
SHA-256: 1ff34cab44508066a72bbb69182268b098907dfc0d2c8fb0ee2360aa0e3cbfe2

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