Malicious PDF — malware analysis report

Static analysis result for SHA-256 97e6fda2d3c2f4ca…

MALICIOUS

PDF

73.4 KB Created: 2021-03-18 12:20:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 25ae618822ea6acede2a0663c0f7343e SHA-1: 5b7fd1c561e0c9387a2d39c811daddc53c3bcc14 SHA-256: 97e6fda2d3c2f4cac4e96fd428b35f45dd30361b52d7d19372cd88a89047f90f
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs are indicative of a phishing or malware distribution attempt, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/123?utm_term=index+laws+tes+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451033/normal_602b4454d49f9.pdfIn PDF document text
    • http://liketsven.xyz/517898511143ylc5.pdfIn PDF document text
    • http://center-about.com/55268420193nj9x9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393644/normal_605070ff8e21d.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://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_1624caa9b7d8424781a68517b1a62e75.pdf?index=trueIn PDF document text
    • http://zunijakokusageg.epizy.com/download_reader_gratis_kuyhaa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36386dbe-0b01-4ad8-bdad-99783d786450/bulovugakap.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_40001b011cfb4283a64a5df6d62230c5.pdf?index=trueIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_c9e2286315be4a7191157a52a2ac8acb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/faa8eb49-0e89-4e7e-b3e7-dc279aac904e/washington_post_magazine_crossword_answers_today.pdfIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_84fd660b674f48c0a9aa64070849065c.pdf?index=trueIn PDF document text
    • http://vulomalizekuvu.rf.gd/69111029890.pdfIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_644b4ae675094b28bc44278c15ca5b34.pdf?index=trueIn PDF document text
    • http://dinelak.rf.gd/direct_mail_advertising_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/897f72e2-8ead-46c6-b010-d32f4becb059/99261884411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94eef50f-2e14-4062-b444-3afad46884be/71103290386.pdfIn PDF document text
    • http://vavegigodal.epizy.com/the_art_of_problem_solving_volume_1_the_basics_online_book.pdfIn PDF document text
    • http://bopenakonaj.rf.gd/full_dictionary_copy_and_paste.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bdd1acb-220c-4c1e-bda8-f0f075da89af/what_is_the_biological_half_life_of_thc.pdfIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_17e7f9d0b557440b822aaa7764fb145a.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_off0000d402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD402 4816 bytes
SHA-256: a03ca6a846760cb72aaea356766868a49f92fd6aeb1394fbf1dba2ad833ded2b
font_01_sfnt_off0000e462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE462 11140 bytes
SHA-256: ce6a331463d7d3dbffc8b01bd3c92f6fcbe1537531a98d731746a7f2d02adcb9
font_02_sfnt_off00010a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A71 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176