Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7dcbb066c047383…

MALICIOUS

PDF

81.7 KB Created: 2021-05-01 03:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ec09fbb43eb6bc74b5cbb4ae9a0dbbfc SHA-1: 5ae1c9a39ae5895c8e62e11c8dfcacebf1d65292 SHA-256: d7dcbb066c047383aeda42f8493db1f31f5d07a9f3bee32c11306d7d0726026a
186 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. 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 0.9993

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://druttle.ru/strik?utm_term=nutribullet+blender+best+price PDF link annotation
    • https://cdn.sqhk.co/lodabazul/9hhyidO/eqt_corporation_annual_report_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/gjhfgci/73600995561.pdfIn PDF document text
    • https://cdn.sqhk.co/bowawugafux/idAoNrb/25436551226.pdfIn PDF document text
    • http://centerverifybadge.com/44663780274nowmn.pdfIn PDF document text
    • https://cdn.sqhk.co/wusoxopejezo/ggvijf7/amrita_nayak_new_sad_song.pdfIn PDF document text
    • http://mebel-albero.ru/72818200346uhvod.pdfIn PDF document text
    • https://cdn.sqhk.co/semiwewedazi/Uigjhgd/7667227844.pdfIn PDF document text
    • https://cdn.sqhk.co/tulotunofuz/gjgjuhf/modern_sofa_table_with_storage.pdfIn PDF document text
    • https://cdn.sqhk.co/wibezudak/hih4hgq/call_of_duty_modern_warfare_under_map_glitch.pdfIn PDF document text
    • http://storeyou.store/gesodufizigasusorfmcbj.pdfIn PDF document text
    • https://cdn.sqhk.co/taxodisilif/xkNjbii/75872239386.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_5eeeb7c4cc6342c592927c83b4fef58b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gumagabu/hp_2035n_toner_cartridge.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/cyclone_rake_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f14ab27-7000-49bf-84bc-6c59ffb9acae/53338217647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2b40967-0231-4bbd-9a5c-77389a7a847e/cant_argue_with_that_logic_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/free_business_presentation_ppt_templates.pdfIn PDF document text
    • https://f516a5e5-1936-4b34-b436-a929b3a34b8d.filesusr.com/ugd/774001_4fb3c1fe98c34223adbd8caa3191d71f.pdf?index=trueIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_e8745f75fa1543a48c8de92f65ab2930.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92dae8b0-fd51-4a57-a46f-ee616f84fbeb/24758524590.pdfIn PDF document text
    • https://ec560393-4650-4708-bf0c-d08fceb8458c.filesusr.com/ugd/ca69db_e671a1538f4142c1869f9735f1094964.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2f64028-5e54-41b0-8fab-04074479fd8d/2761469956.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/voreridesavava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d46e30f2-d1cc-42c5-8b96-16dfd27c372c/washing_machine_parts_around_me.pdfIn PDF document text
    • https://b66a6cc6-7028-4fd7-9d19-084b2b27c535.filesusr.com/ugd/4015cf_e83cd70b70aa47dfa87f26e952527b7a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D6 4964 bytes
SHA-256: 2319e5e56d170cfb69754ea06804d6b81be3f93649dc1cc1ba5e7823a576b417
font_01_sfnt_off000111c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C9 11348 bytes
SHA-256: d3a478ff57cb92b32b2c4db48183a4d6fa7023b3c38539a19792d60eecf04629