Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7f7660ad484c2d…

MALICIOUS

PDF

90.8 KB Created: 2021-03-30 06:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 202bfb8404b0e3ee425c26f9855a58e7 SHA-1: e35b0a5d232fed854f0b4d246ae55823d36df862 SHA-256: ef7f7660ad484c2d0ea7326556503fd81d9a516cc83042b0d49ff0f23296f07c
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and external link farm behavior are indicative of malicious document delivery, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jumiwimov.ru/award?keyword=programmable+logic+controller+interview+questions+and+answers+pdf PDF link annotation
    • http://dewobazul.22web.org/76835000861.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495262/normal_5fe83bcc6039e.pdfIn PDF document text
    • https://domilejoxu.weebly.com/uploads/1/3/4/5/134529458/763c729e779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410214/normal_602183b6df7ca.pdfIn PDF document text
    • http://pufegusikozig.22web.org/mcgraw_hill_4th_grade_math_book.pdfIn PDF document text
    • http://semazolowogafoj.22web.org/cyberghost_for_macbook_pro.pdfIn PDF document text
    • https://tisalupiruj.weebly.com/uploads/1/3/4/0/134018152/fizus-kevisewexinafe-fidefe-texav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422371/normal_603181a48321e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393204/normal_6051ea6f1697f.pdfIn PDF document text
    • https://kalogipewaga.weebly.com/uploads/1/3/4/5/134595512/kiramagixumube.pdfIn PDF document text
    • http://sibidadaduzej.iblogger.org/how_to_clean_honeywell_germ_free_humidifier.pdfIn PDF document text
    • http://fefosawixamuwow.22web.org/schwing_stetter_cp_30_batching_plant.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
    • http://boraxatisota.rf.gd/magic_kingdom_guide_map_2018.pdfIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_79a7f0b2e787477e90800d03de1d5573.pdf?index=trueIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_8e43ccfc4e9049a5809a2ecc5fe507ae.pdf?index=trueIn PDF document text
    • http://jefiwimagi.epizy.com/personal_and_possessive_pronouns_worksheet.pdfIn PDF document text
    • http://wefuzage.epizy.com/52029893317.pdfIn PDF document text
    • http://robowogutalopet.epizy.com/general_warranty_deed_template_ohio.pdfIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_0533f52e58af4c6588b900a402f83735.pdf?index=trueIn PDF document text
    • https://d80f29e5-b60c-4034-b355-14c03cb49cca.filesusr.com/ugd/ff44ec_4a046bc862444f81bcd3682f25bfafe3.pdf?index=trueIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_5b46166e18cd433996c5f6c31e13aad8.pdf?index=trueIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_5839bcb98b304883800cdaebe1c00835.pdf?index=trueIn PDF document text
    • https://6f46ab72-b8e3-4ec2-8f01-cb5d6491dab7.filesusr.com/ugd/9a120b_4f17e3c994084ffd8f109e123dc02d1d.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_off000117b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B9 5776 bytes
SHA-256: dedf0ad969ba0815496e1d653595bcde80b4b4a1ffd6dd01d1bf62a38476e8f6
font_01_sfnt_off00012b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B48 10780 bytes
SHA-256: 4a49f466be89e266e532be7527fe405cc0ec506044d683bed344672feb17b9b3
font_02_sfnt_off00014fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE6 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71