Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dbda81936e3ea01…

MALICIOUS

PDF

65.4 KB Created: 2021-03-21 10:01:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2ed37d4c55b83a4185718d4246d32b27 SHA-1: a945746b35721b4fdc402d79f93f7026e95e3eec SHA-256: 6dbda81936e3ea0182fd893b53865b0fd81de6c24a93089591c64cc6da6f43e4
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 by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of the primary URLs, jumiwimov.ru, is associated with a phishing lure related to programming. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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://jumiwimov.ru/strik?utm_term=what+is+a+loop+in+programming+java PDF link annotation
    • http://nitiwomifigurod.mygamesonline.org/french_demonstrative_adjectives_exercises.pdfIn PDF document text
    • http://clientesdkb.com/kino_mongol_heleer_shuud_uzeh_2017ki9z5.pdfIn PDF document text
    • http://kigetipopizatij.getenjoyment.net/3080932669.pdfIn PDF document text
    • http://trylait.club/ubuntu_12._04_lts_desktop_isoldumz.pdfIn PDF document text
    • https://vademakab.weebly.com/uploads/1/3/1/3/131380849/zenona_vavuxuxekajefi_tepodalegaje_kiruwe.pdfIn PDF document text
    • http://vobafoselalulor.mypressonline.com/zhuyin_pinyin.pdfIn PDF document text
    • https://subinekole.weebly.com/uploads/1/3/2/6/132695692/7f13dbf24ee.pdfIn PDF document text
    • https://nodepuje.weebly.com/uploads/1/3/4/5/134518199/4477182.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/stories_of_the_prophets_al-imam_ibn_kathir.pdfIn PDF document text
    • http://myluckywin.site/79776790380tezzz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fararisujis.myartsonline.com/mental_retardation_treatment.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/how_the_grinch_stole_christmas_songs_1966.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/how_to_remember_the_greek_gods.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/brooklyn_baby_instrumental_free.pdfIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_6d63c058c96047f2bd6e001a03ca99fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/adobe_illustrator_gratis_ita.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/c_template_deduction_guides.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/tigikaja.pdfIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_58a9eba22963467aa32e35343f759bd2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/alliance_of_valiant_arms_free_steam.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_off0000c341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC341 5384 bytes
SHA-256: 88af5ca637bd5b93e592e27f9d702f99c73f0f54cff64724d0636629a7ad5f7d
font_01_sfnt_off0000d57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57B 10032 bytes
SHA-256: 57686bc15697825d531016e4b486e2dc9857acb46b2db55e4603568b60c1ec34

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