Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dfc6b4727f8dd2b…

MALICIOUS

PDF

75.4 KB Created: 2021-02-27 08:58:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c7e48da06238676c7b759990aef227e2 SHA-1: ed7e4ae83205b849c1838f236377e236c808276e SHA-256: 3dfc6b4727f8dd2b9316df2773a6e54a7e17b1929d185ef97b72b6ae77368869
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL being https://jottigo.ru/strik?utm_term=krik+krak+haiti. This heuristic, combined with ClamAV detection and ML classification, strongly suggests a malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the PDF structure itself is used to facilitate the malicious activity.

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 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.
  • 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=krik+krak+haiti PDF link annotation
    • http://libuwapuvewipev.mywebcommunity.org/microsoft_flight_sim_x_keyboard_controls.pdfIn PDF document text
    • https://vavaxumepanev.weebly.com/uploads/1/3/6/0/136097425/61616cfd9.pdfIn PDF document text
    • https://pijaremurepapo.weebly.com/uploads/1/3/1/4/131406688/jibinimape_nejuvopa.pdfIn PDF document text
    • http://niburufajanuto.sportsontheweb.net/58734258790.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/90351398905.pdfIn PDF document text
    • https://pesakezered.weebly.com/uploads/1/3/4/7/134729162/5834288.pdfIn PDF document text
    • https://mefusinumobidal.weebly.com/uploads/1/3/4/6/134679396/senowetap.pdfIn PDF document text
    • https://tawozajoruje.weebly.com/uploads/1/3/4/3/134314125/gukow.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/tavux.pdfIn PDF document text
    • https://nimaxinamupun.weebly.com/uploads/1/3/4/6/134635612/savunuwego.pdfIn PDF document text
    • http://adminhalil.com/goguniroj5zds.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/dufekifaral/50_job_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/8079385505.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/27405023908.pdfIn PDF document text
    • http://wegugoleta.onlinewebshop.net/84966481963.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/how_to_do_a_risk_assessment_template.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/game_one_piece_bounty_rush_android.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_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 4596 bytes
SHA-256: 4489cca475c52066ae3ba3518701847f040be79e2bf63b71a3a226f9bb5016f2
font_01_sfnt_off0000fd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8F 10536 bytes
SHA-256: a4a85a148bb953a1c3867a4abf3e21843d11f15947e63319e040a3c001f94ed7

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