Malicious PDF — malware analysis report

Static analysis result for SHA-256 3133823237b75049…

MALICIOUS

PDF

77.7 KB Created: 2021-03-17 17:05:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 79c4f48e9d2f9b3f840f247c89fe35d2 SHA-1: 2ca0658d4e970421e7430819a63769d88f56cee4 SHA-256: 3133823237b750497b96f48d549eacf935ee40983fa71ac4eddb4029abefcd59
224 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. It contains a link farm and an embedded URI pointing to 'kuzutuzo.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'robinhood customer service', indicating a lure to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 8

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kuzutuzo.ru/strik?utm_term=how+do+i+contact+robinhood+customer+service PDF link annotation
    • http://siwosupegejolop.medianewsonline.com/biodegradation_plastic.pdfIn PDF document text
    • https://cdn.sqhk.co/ragebobeb/gijghhc/accuradio_jazz_burners.pdfIn PDF document text
    • https://vekaluledezo.weebly.com/uploads/1/3/4/2/134235689/mopudexivuxepa.pdfIn PDF document text
    • http://rezexepenoma.scienceontheweb.net/ziwijusijofagetavaz.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/cGhbTjg/niner.pdfIn PDF document text
    • https://dugemitisij.weebly.com/uploads/1/3/1/4/131409309/zujaxirife.pdfIn PDF document text
    • http://fuvusawomere.22web.org/22270012948.pdfIn PDF document text
    • https://dosisusibifoba.weebly.com/uploads/1/3/4/2/134236234/2615402.pdfIn PDF document text
    • http://levojefozaloro.mywebcommunity.org/business_intelligence_tools_for_small_companies.pdfIn PDF document text
    • http://copyrighthelp.info/93160237689646yq.pdfIn PDF document text
    • http://xovitixekewelom.scienceontheweb.net/46510612624.pdfIn PDF document text
    • http://yozi.store/calendario_laboral_2019_catalunyai7ji3.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/a3pgdg3/sikaninumezil.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/xapidajovaji/75447083986.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/cat_416_backhoe.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/dosir.pdfIn PDF document text
    • http://difosotaj.epizy.com/nexogegetowedu.pdfIn PDF document text
    • http://tiriburud.rf.gd/neripakudalomufemadeta.pdfIn PDF document text
    • http://xazerusovugidu.epizy.com/hypomania_treatment_guidelines.pdfIn PDF document text
    • http://siniligavaxuvul.onlinewebshop.net/is_dr_fuhrman_diet_healthy.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/jarilorabewixonox.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/how_to_buy_stocks_pre_market_questrade.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_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 5400 bytes
SHA-256: b3177a9b1f81a7af325427f49794e479bb15ab509ea31441cb299b90dc412977
font_01_sfnt_off00010260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10260 11300 bytes
SHA-256: 9560388706d37ac9bf798b28cfec2da3ac774f573883c0c5e0090516920dc977

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