Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f70b25e55d77b09…

MALICIOUS

PDF

79.3 KB Created: 2021-06-10 14:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 33a362bca2d3df50c86422cd5ebaf291 SHA-1: 1f42d40d45d14900cb80140feceab8c7194c1a26 SHA-256: 8f70b25e55d77b0958a6d576aec47f5ae35a1fb4498dee22ee70705a588fd174
226 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. It uses a password-protected-archive lure. 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 0.9997

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://catamma.ru/pbw?utm_term=crossover+ccat+test+answers PDF link annotation
    • https://petominezejoza.weebly.com/uploads/1/3/2/3/132303337/6541993.pdfIn PDF document text
    • https://zitavumerut.weebly.com/uploads/1/3/4/4/134465292/verobutakusemip-lebanafoz-nosimuzojinal-vipivaz.pdfIn PDF document text
    • https://lonamejekewow.weebly.com/uploads/1/3/5/3/135396766/pafigejumiw-pizamoruse-pipiwita-kedal.pdfIn PDF document text
    • https://pazolumaf.weebly.com/uploads/1/3/4/3/134356568/fideda-kisotes-wuzivijumiwe.pdfIn PDF document text
    • https://wakepazatojux.weebly.com/uploads/1/3/0/8/130873951/80118.pdfIn PDF document text
    • https://bomaripuxizidul.weebly.com/uploads/1/3/4/9/134901287/ropamoxibevo_gulaxeziti_patixidulikig_remebalurozetew.pdfIn PDF document text
    • https://fegopamaxu.weebly.com/uploads/1/3/4/8/134896151/karit-womanufita-goneliwafulaxav.pdfIn PDF document text
    • https://noderewowiful.weebly.com/uploads/1/3/4/5/134596184/jupepodenoro_daxefu_wovatexe_zelulimolab.pdfIn PDF document text
    • https://zotadapavera.weebly.com/uploads/1/3/4/4/134483721/sezojojazore-neguxonigodaruz.pdfIn PDF document text
    • https://funovupudejo.weebly.com/uploads/1/3/4/4/134473131/mekomugekulofi.pdfIn PDF document text
    • https://wabezapodila.weebly.com/uploads/1/3/1/4/131437306/032a8796.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3e6be4b-6b1c-4a10-b849-699aad6c8bdd/68583964075.pdfIn PDF document text
    • http://pefumugat.pbworks.com/w/file/fetch/144683190/panedapuxov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d917ab3-d1a6-4bf0-82e3-fdeefcc1ce85/what_is_68_kg_in_stones_and_pounds.pdfIn PDF document text
    • http://nilidix.pbworks.com/w/file/fetch/144830262/rar_password_remover_download_free.pdfIn PDF document text
    • http://sofutikajen.pbworks.com/w/file/fetch/144969858/14620610455.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/61008059720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d756bf17-05dc-4b44-a3e1-d4c1fa613204/vogugojazituka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba6d5169-5c50-4cd3-9620-32dfd9106f74/gakesulogejejonizobiki.pdfIn PDF document text
    • http://favixose.pbworks.com/f/79137009104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/845feaa4-e1a6-4f98-8be3-b380a81bef78/who_is_stronger_kakashi_or_the_white_fang.pdfIn PDF document text
    • http://vikowezanipe.pbworks.com/f/ielts_academic_reading_heading_matching_practice.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_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 4816 bytes
SHA-256: 9fb493789646ed1a28f40dc19e378ea9858202a32d6aa97f8fffa6ee3290b459
font_01_sfnt_off00010879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 11624 bytes
SHA-256: f648beaac8b56c4e444815dac4497a679b51eab4c6ff0a7718893c3fef3a1f10