Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df3cbd867c982a1…

MALICIOUS

PDF

86.8 KB Created: 2021-02-24 15:55:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5cba93326eb8dd2cdd49a1b035b10b04 SHA-1: bc1ab5c1bcbced47019dec3717ef307ab4fbbf0d SHA-256: 2df3cbd867c982a19fdd72b77541b3654e9629e5521965004de4ecdb20dfc27f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO link farming or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs, such as the one pointing to 'leonvi.ru', are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://leonvi.ru/award?keyword=accuair+e-level+touchpad+controller+manual PDF link annotation
    • http://innov-cis.net/551318590471vj01.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/whirlpool_gold_fridge_filter_reset.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/el_mundo_de_sofia_english_subtitles.pdfIn PDF document text
    • http://groshyk.site/gudimuparuxunzbkw.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/tripura_rahasya_hindi.pdfIn PDF document text
    • http://golixudib.mypressonline.com/53811559933.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/human_resource_management_calicut_university.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/49539346240.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/2646700.pdfIn PDF document text
    • https://gisodotok.weebly.com/uploads/1/3/5/9/135971357/weruk-pulogati-napegadelak-pemaremixaxaxo.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/tofizo/all_india_radio_music_competition_2018_form.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/schedule_template_free_online.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/anxiolytics_davis.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/data_analysis_with_pandas_and_python.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/xirizugizenurisuzanu.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_off00011210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11210 5216 bytes
SHA-256: 926de1ff4dbf330380eeb9765d4ab46147cc962cdcd37cfdfb29efd4a074f18d
font_01_sfnt_off000123b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B3 12952 bytes
SHA-256: a14ed28af22169e9ce49dca3ed3e1fa14ec11fd252b682c4825d54f4c9ece571

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