Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64ffab781d1cd65…

MALICIOUS

PDF

74.2 KB Created: 2021-03-21 08:02:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34a2c65274dcdc033190eb6ccf6582fd SHA-1: 56e62f31d8d7b9f53b876fa63ddbc89756db14c2 SHA-256: b64ffab781d1cd655e48f783520a54cc2f2f3b68adaf1db29b08831ada612c81
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to appear as search results for a calendar. The primary malicious URL, https://mezovuduw.ru/award?keyword=calendario+mundial+rusia+2020+pdf+chile, is likely used to distribute further malware or conduct phishing. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=calendario+mundial+rusia+2020+pdf+chile
    • https://tawugeri.weebly.com/uploads/1/3/4/7/134774142/855641.pdf
    • https://laxonetamaj.weebly.com/uploads/1/3/4/0/134096763/4932778.pdf
    • https://pizakatunif.weebly.com/uploads/1/3/1/8/131856177/gawopuvigareperet.pdf
    • https://zuwizogagotajal.weebly.com/uploads/1/3/4/0/134012426/8a689.pdf
    • https://gikanusubidi.weebly.com/uploads/1/3/4/7/134756500/sesaxobipubowu-maxetuliguxog-mudutusasiduli-wavebuz.pdf
    • https://rozolabo.weebly.com/uploads/1/3/0/8/130814594/1072375.pdf
    • http://wekanisa.scienceontheweb.net/similarities_between_greek_and_roman_theater.pdf
    • http://gidusalutuwisut.iblogger.org/97417782685.pdf
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/vepifupumu-vupobatumi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tedowafomaru/40853580931.pdf
    • https://s3.amazonaws.com/firigugixujotov/battle_cats_mod_apk_anti_ban.pdf
    • http://sagoralezerelo.onlinewebshop.net/international_marketing_definition.pdf
    • http://ririgigiwabub.epizy.com/57860236401.pdf
    • https://s3.amazonaws.com/tamobalasu/6124163840.pdf
    • http://tudixuzaw.onlinewebshop.net/32867967754.pdf
    • https://s3.amazonaws.com/loneminovu/mokajafarojodefatu.pdf
    • http://tosefiwaniw.rf.gd/tuvemawejoruwodunewi.pdf
    • https://s3.amazonaws.com/pafiganovavi/86138487346.pdf
    • http://jaberorer.epizy.com/feloti.pdf
    • http://jaremov.rf.gd/sesumaniganowelebol.pdf
    • https://s3.amazonaws.com/vetamedisoz/speed_queen_washer_manual.pdf
    • https://s3.amazonaws.com/rabewiruzitewa/sadness_and_sorrow_naruto_flute_sheet_music.pdf
    • https://s3.amazonaws.com/sefabe/kijut.pdf
    • https://s3.amazonaws.com/xomudufe/learn_japanese_app.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0dd.bin
bf1ab26405e3b0f9b8b0a859dc4f61cd8451c32674f4b60c43db7332ed8d4f02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DD 5572 bytes
font_01_sfnt_off0000f39e.bin
b68c7177652dea667a8ebe03f72c22e24b1bc2a8a1e8117a3e8d0c5a3b2e161e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 11556 bytes

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