Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa99fc254275cdf…

MALICIOUS

PDF

145.6 KB Created: 2021-06-03 10:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b87e82b2a5f5340b4d472066b1e02937 SHA-1: 8fb967efc47371b9b956525ce5e6eca5bf1e9459 SHA-256: 6fa99fc254275cdfdb530c75d3377c2827c672b3ee8e388c2315ddc924bcc147
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=arduino+mega+2560+programming+pdf PDF link annotation
    • https://wosowabo.weebly.com/uploads/1/3/4/3/134340570/vunerizedekuwuf.pdfIn PDF document text
    • https://tozuriko.weebly.com/uploads/1/3/1/4/131437247/ae8d13ab1ba.pdfIn PDF document text
    • https://niladomawinur.weebly.com/uploads/1/3/4/8/134875702/vatulalopo_zolov.pdfIn PDF document text
    • https://sawuraba.weebly.com/uploads/1/3/4/7/134720576/boniliro_lixatovusi.pdfIn PDF document text
    • https://zogazakuf.weebly.com/uploads/1/3/1/6/131636678/xaduvep.pdfIn PDF document text
    • https://doxazijizule.weebly.com/uploads/1/3/4/6/134640144/dagowuxedixusoza.pdfIn PDF document text
    • https://kelonefak.weebly.com/uploads/1/3/2/6/132683111/lebeluxe_xamitudarof_zitupareponazu_logavowuwowep.pdfIn PDF document text
    • https://sawuwirepugasup.weebly.com/uploads/1/3/0/9/130969548/jigivideboze.pdfIn PDF document text
    • https://tugixafebav.weebly.com/uploads/1/3/2/6/132681891/1291708.pdfIn PDF document text
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/8411504.pdfIn PDF document text
    • https://kukixagunobi.weebly.com/uploads/1/3/5/3/135325453/ritogipozodanes.pdfIn PDF document text
    • https://gafekiwukuwemul.weebly.com/uploads/1/3/4/3/134313713/0767a025.pdfIn PDF document text
    • https://weroxodadugofu.weebly.com/uploads/1/3/4/5/134503620/xunixura_xaxojegobus_binamiwus_ripotanokini.pdfIn PDF document text
    • https://pifelisadejo.weebly.com/uploads/1/3/4/8/134884126/9579931.pdfIn PDF document text
    • https://tedovuja.weebly.com/uploads/1/3/4/4/134465286/c3d566178c3c67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kelivesas.pbworks.com/f/difference_between_concrete_and_abstract_nouns_examples.pdfIn PDF document text
    • http://dipoziw.pbworks.com/f/why_my_download_stops_at_99.pdfIn PDF document text
    • http://rimikupababo.pbworks.com/w/file/fetch/144534462/n3ds_emulator_download_ios.pdfIn PDF document text
    • http://gupiguna.pbworks.com/w/file/fetch/144532611/the_book_thief_study_guide_answers.pdfIn PDF document text
    • http://xuvabufoj.pbworks.com/w/file/fetch/144459630/what_is_the_work_of_hvac_supervisor.pdfIn PDF document text
    • http://xujefix.pbworks.com/f/92200250007.pdfIn PDF document text
    • http://pakesobiroge.pbworks.com/w/file/fetch/144542340/summertime_saga_old_version_mod_apk_download.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_off000201e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x201E2 5692 bytes
SHA-256: f5cebc7b21344480594fb5bd9e41aee6dc141bbd2c4cd3484ce653ee0f3f4d45
font_01_sfnt_off0002152c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2152C 10840 bytes
SHA-256: 8adfe1ef9347631415d73f72a310956f6ff95a2b4cf09801b91124ece92cd957