Malicious PDF — malware analysis report

Static analysis result for SHA-256 76935845b7a2ec64…

MALICIOUS

PDF

69.7 KB Created: 2021-02-15 16:54:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 814276bdd9d90814a8bc64151600b418 SHA-1: 94111ab5297adb54732031177f223068b9712cf3 SHA-256: 76935845b7a2ec64ebb87d72802b969585dd8667dffffccf0383de2715a9d746
222 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wix?keyword=tyler+the+creator+wolf+zip+download'. Additionally, it exhibits a PDF link farm heuristic with numerous external links, including 'http://mobapur.iblogger.org/bhai_bhai_video_song_pagalworld.pdf'. The ML classifier also strongly flagged this PDF as malicious. These findings indicate the document is designed to redirect users to potentially harmful sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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://yafferge.ru/wix?keyword=tyler+the+creator+wolf+zip+download In PDF document text
    • http://mobapur.iblogger.org/bhai_bhai_video_song_pagalworld.pdfIn PDF document text
    • https://tololomajaju.weebly.com/uploads/1/3/4/4/134472688/lapajukak-retidowulag-xesoga-metuzefafijajew.pdfIn PDF document text
    • https://kejobogufepemis.weebly.com/uploads/1/3/0/7/130775396/b90e672a52d.pdfIn PDF document text
    • https://dilozerekake.weebly.com/uploads/1/3/1/4/131452754/sugakuxufa-tazoderun-jaxivuwex.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/tujeviwakirawu/dadalomitazeve.pdfIn PDF document text
    • http://gugakalorezo.epizy.com/joxil.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/affirmative_imperative_form.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/5005720784.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/baixar_facebook_messenger_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/financial_report_analysis_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/nudasizula.pdfIn PDF document text
    • http://biwodonugawodil.rf.gd/sample_of_formal_letter_ending.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/communication_skills_presentation.pdfIn PDF document text
    • http://kotasogova.rf.gd/rasatosa.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/reit_performance_rising_interest_rates.pdfIn PDF document text
    • http://dasutako.rf.gd/17723928684.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/53012258362.pdfIn PDF document text
    • http://goruwon.epizy.com/31007848061.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/cheran_express_platform_number_in_chennai.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_off0000d4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EC 5256 bytes
SHA-256: aadd9ceaed6f5294d19b02e12bd3aa3a2f26ed5bf98e080f8eb4b40c4a31465e
font_01_sfnt_off0000e6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E9 10016 bytes
SHA-256: bcf8cfd198dca21cdade4b85f477c91c25a3f6a1bdecf852e78a28a36810a1d5

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