Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1094a40b8b7ce3…

MALICIOUS

PDF

67.9 KB Created: 2021-05-03 17:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 788f0ffd26c0bd9a368704eb794a42e3 SHA-1: c18469c5b4c8705ae500ced62814435a4de39133 SHA-256: bf1094a40b8b7ce3ee3701784aebc24cd5f2e802eae68c4326295fba1df7f09f
156 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 0.9998

Heuristics 5

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=dungeon+master%2527s+kit+pdf PDF link annotation
    • https://cdn.sqhk.co/wogokodu/Liiiajf/wagner_control_pro_250m_vs_250r.pdfIn PDF document text
    • https://mozepuboxiwagu.weebly.com/uploads/1/3/6/0/136094106/wovumov.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/rZje61I/leon_s_kennedy_resident_evil_2_remake_wallpaper.pdfIn PDF document text
    • https://nitetawowi.weebly.com/uploads/1/3/5/3/135301411/tubuwepud.pdfIn PDF document text
    • https://xoxomedeze.weebly.com/uploads/1/3/5/3/135308121/0d267623bbd3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cb70cc59-2297-49c3-b7e2-2ac7e26e28d4.filesusr.com/ugd/4479ed_4853241e229346559d27c0c33d04082c.pdf?index=trueIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_d691fb8d8cec4c17ad702191c3c89b66.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/conjugate_acid_base_pairs_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/exercice_orthographe_cm1.pdfIn PDF document text
    • https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_c2a8909a3cef403389fac970b5db91f3.pdf?index=trueIn PDF document text
    • https://aefb6378-f3ca-470a-b9d2-22936542d087.filesusr.com/ugd/fe129c_63aa59847f7f4b41bcc2d5b25d57c21e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liwara/nefovedefelibinukifo.pdfIn PDF document text
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_6fb7723ffe0845189fc8459920dd2f2f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/edit_email_templates_in_salesforce.pdfIn PDF document text
    • https://d25e5d79-f3dc-43ab-8538-58f2f4730235.filesusr.com/ugd/898300_8cb72a987c1c4565a325715f4a289760.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zinudipir/how_to_thread_an_old_janome_new_home_sewing_machine.pdfIn PDF document text
    • https://7054f9d6-44ea-4b6c-8535-0d04e7cb9957.filesusr.com/ugd/963b03_484124c18c2a4c48af88656c223e5d07.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB49 5428 bytes
SHA-256: 6fe50e0c2af004bb8fcc1f15bdf4829f06728dc9b657bf3c2d2aa7917e55a8d3
font_01_sfnt_off0000ddb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB7 10880 bytes
SHA-256: 7503ce34aa0ab6b419f6ef8eb0906684771e20eb0d27e8818647e474b5795271

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