Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c44dc8e5377a5b…

MALICIOUS

PDF

71.2 KB Created: 2021-03-29 16:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 808ccb22b76a3350383126434d646b9f SHA-1: 24eae86e3006c8654e34706a5013ae6149313203 SHA-256: 75c44dc8e5377a5b8297ed931bf5ba2a28508e9e826a217472d3cf2677228158
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://jacksth.ru/strik?utm_term=atomic+structure+vocabulary+worksheet+answers PDF link annotation
    • http://free-at.pro/75906947974iyikf.pdfIn PDF document text
    • http://dombitarf.ru/antecedentes_de_los_derechos_humanos_en_estados_unidosq0yai.pdfIn PDF document text
    • http://tersq.fun/b._a._p_warrior1qolx.pdfIn PDF document text
    • http://rankingcoach-apps.com/ccms_full_formgaaow.pdfIn PDF document text
    • http://kotonopiz.iblogger.org/zowamop.pdfIn PDF document text
    • http://zalavsky.ru/56268387843yeks7.pdfIn PDF document text
    • http://dream-stat.ru/john_deere_410_backhoe_for_sale_near_mevdhhj.pdfIn PDF document text
    • http://rankingcoach-apps.com/how_to_write_1000_to_2000_numbers53cjb.pdfIn PDF document text
    • http://realwockyc.info/211216310571lbt7.pdfIn PDF document text
    • http://tesepaxe.iblogger.org/65329814935.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://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_5458731056b043b6863b800868a0d943.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/hypogonadism_guidelines_nice.pdfIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_964eb3a932c4457e8ec577d69d1783a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/lg_tv_codes_for_directv_genie_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/844dda78-b57e-437a-bd9a-94d5193d665f/disney_cast_member_discount_halloween_party.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e4faa3e-be33-4640-a1d1-9d0dfe283070/petsafe_wireless_containment_system_collar_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e34e8b-e5b8-4bcd-b838-37af83a739b2/why_does_my_washer_smell_like_rotten_eggs_when_it_drains.pdfIn PDF document text
    • http://kijemuf.epizy.com/19242245449.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/pesofapuwer.pdfIn PDF document text
    • http://kirogebi.epizy.com/manipabalogekodivadizilaw.pdfIn PDF document text
    • http://somukagokololu.rf.gd/mixevinejozeliz.pdfIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_540f949090694547ab3016f562631969.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eb13624-4288-4827-a256-a08c533e1a5a/wodoruseluson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3269181d-63d6-4974-bc03-e53c4da2d198/how_to_program_bose_remote_to_directv_box.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/vijubidenolobozivane.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3D 5368 bytes
SHA-256: ef512b43990640399f0c7aedf5e7c685f623f67945a85d0069f651f6884c4866
font_01_sfnt_off0000dd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6C 10324 bytes
SHA-256: 7d0ee2ab9756f6bddeefd03cfe8b9d8358d3ca138764d164c021f79cd3c2825f
font_02_sfnt_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f