Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b79f684eb9e16c…

MALICIOUS

PDF

88.3 KB Created: 2021-03-26 09:07:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6e4baca782d8ba468cfb20376344f11f SHA-1: 56e3d42ed0059c662eb5738a17421498f49b8e5f SHA-256: 38b79f684eb9e16c2769625647aec1f95e250bde9cc6a1669cecf567817a9440
226 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. It uses a password-protected-archive lure. 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 0.9980

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://zajinet.ru/strik?utm_term=livro+perdida+ler+livros PDF link annotation
    • https://cdn.sqhk.co/farosexuto/MNifMHd/webexefugamifix.pdfIn PDF document text
    • http://rubolanir.mypressonline.com/nutritional_value_of_agaricus_bisporus.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/65474570351.pdfIn PDF document text
    • http://egosikenclub.com/luxupogfqu7.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/ickjcjj/ranagipudejasotadenu.pdfIn PDF document text
    • https://cdn.sqhk.co/dodanadofu/ggmjdvi/skillmill_go_price.pdfIn PDF document text
    • http://7lessons.space/how_much_is_a_citizen_watch_batteryqs37w.pdfIn PDF document text
    • http://onsideball.info/bachelor_diploma_template1524g.pdfIn PDF document text
    • http://kkkirrreeee.space/siwapopuwotediufacc.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/0W5ifhh/cutting_the_cake_wedding_songs_modern.pdfIn PDF document text
    • http://xomunuxeju.sportsontheweb.net/michael_vey_the_prisoner_of_cell_25_summary.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/43279142231.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/10193746-5f64-4d93-a419-c50ddcfda0fe/62320138389.pdfIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_44103ce069374965a48d4a46dc4093d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2c38089-bc12-4726-b850-e141ccc061a8/the_vampire_diaries_books_barnes_and_noble.pdfIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_e8bb1c8f082c40ca8b155358d45064ef.pdf?index=trueIn PDF document text
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_bd81ac1dfec448f89cb09846a71df49a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4904fc53-1b8a-4cc6-bdf8-bfe8ff380ccf/how_to_put_away_graco_pack_and_play.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90663cc8-6d6c-4a4e-aeaf-1cf615d8aee0/wunabufotus.pdfIn PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_99cdd06514ad4ca0857ee4943de71fa1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da80d95a-0d46-4189-8a39-cb363ffb47a3/windows_10_all_in_one_iso_x86_x64_activated_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e37a7fc4-10ed-4f5a-a764-a3ff6d42f159/logitech_x100_bluetooth_speaker_price.pdfIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_1c581e295376443099bf5172c832fc2e.pdf?index=trueIn PDF document text
    • http://palelezugob.onlinewebshop.net/what_is_torah_law.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f0cee90-e7a1-4664-8a1b-8e4f319a27b6/xomobozezogokidulujuz.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82F 4952 bytes
SHA-256: d1bc8000ae415769d62853be81cdddc1c744b5191419b1fd31538f795c11e6a2
font_01_sfnt_off00010917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10917 1964 bytes
SHA-256: 7c4880219e9625d2a4e9dd9baa4d28a857a57833d139bcdeda5c52338edb6e7f
font_02_sfnt_off00011223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11223 13284 bytes
SHA-256: 7f331218298574e93e3cdd06b998e6d267ae2835df34a55c509b81ff6fe58974
font_03_sfnt_off00013af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF1 16660 bytes
SHA-256: 451a97a76e1cd188b335db18aa59b090969584b10ed985ec5dcca0b5cdb1d7ae