Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2da2aec5ec2d9f…

MALICIOUS

PDF

105.5 KB Created: 2021-03-31 17:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 81b3c546c289826c82fe369482333e9c SHA-1: 20178a2f6b373c2ee98cb4003c331aeb74a9e3cc SHA-256: 4d2da2aec5ec2d9f00bf0f5b0428b9206f4b51a7864859724026e64f1a54cce4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 domains, suggesting a link farm or phishing operation. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a deliberate attempt to create a network of links for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://dugedepap.ru/123?utm_term=khadya+suraksha+card+sanshodhan+form PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372719/normal_6011b675e3814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499285/normal_60367fdd3463e.pdfIn PDF document text
    • https://cdn.sqhk.co/pisupuwov/8ibgfif/17984253175.pdfIn PDF document text
    • http://degimoto.22web.org/counting_words_in_a_sentence_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/wupofolizaj/Rhfiche/cheat_code_for_sims_4_money_xbox_one.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_600df77f7ce47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461498/normal_600f5cf95941c.pdfIn PDF document text
    • https://cdn.sqhk.co/gowozepugax/aYjhejf/ballymena_academy_former_pupils.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_16b04d9a2c2949fb93b68d27aeccd119.pdf?index=trueIn PDF document text
    • http://sonasekofuxix.rf.gd/1520398921.pdfIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_598b961695e1447480378cbf45e0c08d.pdf?index=trueIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_fa73d4279e194ea6bd11d54c1904527a.pdf?index=trueIn PDF document text
    • https://3e021c9a-284a-4c54-9ba1-f6d43d4d2ba5.filesusr.com/ugd/a619af_11e4e3849bfd4a47bcadb91c54c371b4.pdf?index=trueIn PDF document text
    • https://79d8ee67-2172-45f8-9737-086b37aa5bdf.filesusr.com/ugd/2ab2ae_d05e9f84e3864fd1b8034794894b4a93.pdf?index=trueIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_7ae284a069d449ada0190eb9471ef4f4.pdf?index=trueIn PDF document text
    • http://petilawunabebi.epizy.com/kohler_generator_service.pdfIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_f9520af850534f17b1f00cb8407b9e11.pdf?index=trueIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_e12e0d35421c440d86ff0913d1978b07.pdf?index=trueIn PDF document text
    • http://zukevajisuw.rf.gd/98439369504.pdfIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_33dd29c3f904478586e212bb578cf270.pdf?index=trueIn PDF document text
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_275c218ff6da459d8433ce3aa7fdb9f9.pdf?index=trueIn PDF document text
    • http://xufojeji.epizy.com/41027610769.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FE 5364 bytes
SHA-256: 4f7a8c230a4ad3a1b1d757f42a0cab8083ea67de941cfee3eaa715d3953b8c30
font_01_sfnt_off00011a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1A 9436 bytes
SHA-256: 43fead81d31744f55f00badfd5867a904574d801a383ebf1a06340847d256b1a
font_02_sfnt_off0001380c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380C 10584 bytes
SHA-256: f5d054f6d29c406d9655291c72303204f4ce6913bac0ecbc3b34dfa9f4c48081
font_03_sfnt_off00015c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C60 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8
font_04_sfnt_off000171b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171B6 11348 bytes
SHA-256: 58c278329efca392939b3e24bd9e7472d9fce8e7aa397634096c7bca31b4277b

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