Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df54cf4f19f3bda…

MALICIOUS

PDF

77.5 KB Created: 2021-03-17 08:30:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a086a825b3be02740bdd3f6b2c2a3352 SHA-1: 5e47297ca0b66217986eab2b743ecd2aeafea21e SHA-256: 6df54cf4f19f3bdac0f198da1dec4d4c22530ff0dd76ff523024cc068b6f4b4d
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://midufefew.ru/award?keyword=malaria+parasite+test+procedure+pdf PDF link annotation
    • https://cdn.sqhk.co/dutudovajud/cbgfjeP/foguwoma.pdfIn PDF document text
    • http://sowakowakemim.mygamesonline.org/83563310308.pdfIn PDF document text
    • https://cdn.sqhk.co/xogudililavo/PRljjje/download_mp3_player_for_macbook.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/FeVjgia/38368075287.pdfIn PDF document text
    • http://devedilazabu.medianewsonline.com/sosajerukiwafolowilejos.pdfIn PDF document text
    • http://beach-fruit.fun/ethics_in_psychology_reading_1_worksheet_answers1w2x6.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/FhhihbZ/lepopawetumisapedigagoruf.pdfIn PDF document text
    • http://natgood.space/cambridge_english_empower_a2_online_workbook_answersxqbs9.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/rjcFD4N/dj_player_app_for_laptop.pdfIn PDF document text
    • https://cdn.sqhk.co/xadeviro/agWheCd/17684556505.pdfIn PDF document text
    • https://cdn.sqhk.co/xubuguxovim/XTEzwt3/93420415988.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/naMjgEo/mercury_retrograde_2020_printable_calendar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_aa97ba3821534083a9356f1b854449cf.pdf?index=trueIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/free_online_nursing_drug_reference_book.pdfIn PDF document text
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_cdd155f6e7704155a69e90c712c6e45b.pdf?index=trueIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_92d7222dca894e3398801477126cec69.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_200406b5ec9e4edd90b33f61058d5002.pdf?index=trueIn PDF document text
    • http://tososite.onlinewebshop.net/unity_web_player_games_online.pdfIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_ed1077827f97449899b1338bbeff30e9.pdf?index=trueIn PDF document text
    • https://8b62b971-d575-4461-ae89-9de7a2afac08.filesusr.com/ugd/c5a911_d7fa917b07ea41cc8aad5bda2afa424f.pdf?index=trueIn PDF document text
    • https://3e80c8bf-0031-4ca1-bfa9-4484641fefed.filesusr.com/ugd/08103e_af8a4de3b555466390bf93849a4c5f3d.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE646 4932 bytes
SHA-256: 904ae514cdc94c738a101a1cfe9022380737f9642ebee0b2a3d65f834421314e
font_01_sfnt_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 10244 bytes
SHA-256: d02d36d8f96c95016cfabd0ae5587908f66522213cd8ce2db5a3c59b1c7cb753
font_02_sfnt_off00011a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c