Malicious PDF — malware analysis report

Static analysis result for SHA-256 682146bef68aca8d…

MALICIOUS

PDF

81.0 KB Created: 2021-03-17 13:23:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8e21eb7fa1420c312856c01d70dde161 SHA-1: 82b6bebae3517addfddc357d3145b24a179295a2 SHA-256: 682146bef68aca8d56747d6c9fae9f0e0a97df88d0938b74a8b8c3070ac79a69
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-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.
  • 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://zajinet.ru/wix?keyword=hill+climb+apk+free+download PDF link annotation
    • https://cdn.sqhk.co/tedalome/hc9rjl2/tubi_free_movies_and_tv_shows.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/ghicXgg/netflix_movies_for_kids.pdfIn PDF document text
    • http://zozegakipuvi.iblogger.org/jasiriz.pdfIn PDF document text
    • http://pexukakadom.22web.org/572531485.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/5dYRhgQ/crossword_mysteries_season_1_episode_2_dailymotion.pdfIn PDF document text
    • http://masumog.22web.org/what_is_news_flow_in_journalism.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/jiaibKv/52367263329.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/5d6ae795-86a2-4a2f-a551-d13a1109cbba/firowuvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe8d1ee5-09ee-47a6-b2e8-55c581da6fe2/pepewerigenapobiliz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1132478-c376-4d5d-89dc-e318c84fec2d/ap_biology_textbook_college_board.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21bc9a8e-f77d-4cb6-bc67-1eb872981d31/how_to_start_a_generac_generator_manually.pdfIn PDF document text
    • http://bumilofu.rf.gd/sitatenib.pdfIn PDF document text
    • http://falivodekolulo.epizy.com/convert_word_document_to_apple.pdfIn PDF document text
    • http://demajipo.rf.gd/tabonevurave.pdfIn PDF document text
    • http://kifemulawej.epizy.com/viparesadotat.pdfIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_6e54b2c34c844970b4de0a45f621e799.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1625e577-9cd9-4387-b04b-79e3401adafe/60838520170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1104d737-f9ee-43bf-bd97-3c0ac5cc8dcd/pariregiripelexovutevoj.pdfIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_99ce997a204a4e02aad9c6804c8f45f4.pdf?index=trueIn PDF document text
    • http://totiwofosu.epizy.com/91272550482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdf28b66-b4fa-4991-9f96-a8bdb0747ab6/jopizulafe.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAC 5380 bytes
SHA-256: bf8021f1620c06d05f6907e34151695b4cf9d1a3835f302a30f1e890753c575b
font_01_sfnt_off0000fced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCED 10664 bytes
SHA-256: 40f24228cafc0e4f2b9060d563391aea1b2bc25760c153575b08755f9fe8e466
font_02_sfnt_off000121bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BC 16076 bytes
SHA-256: c26df5a654703d82c4b49e3d99d7624c72720c83e2144c41d2616ef18af3c653