Malicious PDF — malware analysis report

Static analysis result for SHA-256 74445ca3f7f67806…

MALICIOUS

PDF

78.9 KB Created: 2021-05-22 03:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cd3c8cbc1db0ed9a74fe89c93eb9210a SHA-1: 59bc61255085fab94c3e74b0c718fb85d63a659c SHA-256: 74445ca3f7f67806ce64fc8cdf6d294886098fb803f577c38697bdf5194b64c0
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for SEO manipulation or to distribute malicious content. The primary IOC is the URL 'https://jottigo.ru/strik?utm_term=pop+rock+and+soul+reader+ebook', which is likely the initial lure or payload delivery point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/strik?utm_term=pop+rock+and+soul+reader+ebook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421466/normal_6064ee8d3a075.pdfIn PDF document text
    • https://tapogizixe.weebly.com/uploads/1/3/4/8/134897788/2b383946934edc.pdfIn PDF document text
    • https://zodoxofavuzawa.weebly.com/uploads/1/3/1/4/131437464/barogegikewil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446643/normal_6009191a108bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_5fe62d4eb6da7.pdfIn PDF document text
    • https://zenamuvevabun.weebly.com/uploads/1/3/1/4/131453902/kojukuxiwinirotal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451212/normal_5ff262b2d41fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471273/normal_600f42f497454.pdfIn PDF document text
    • https://nusubilumib.weebly.com/uploads/1/3/5/3/135347333/3910665.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/1bcd004b-16b0-437b-8534-be75251a376b/aiag_spc_manual_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9389b3e3-a2b9-47c0-a7d5-40b95e7cb1d6/71005839066.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96550fe9-b7c3-4680-b12a-d83b30e5801f/health_ometer_scale_error_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19155b6e-1736-4f84-b480-88cbb8650210/manual_de_carreo_resumen.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/brlps_exam_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/who_is_the_wife_in_wolf_of_wall_street.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9937598a-d050-4e51-9cbf-63d01fe24369/biocalculus_calculus_for_the_life_sciences.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d102658-bc4c-480b-b73e-686654cdc30a/sowajakotajoje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b25fff41-1367-4d48-9ac4-3d3b2f480f80/death_note_characters_real_movie_l.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0df16998-40c4-468b-9947-2f5713ded69e/unity_games_unblocked_google_sites.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/suwefamimejimozip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/962b5621-43e4-4746-a220-b33eecddea72/jesus_be_the_centre_lyrics_vineyard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/762dea04-effe-4a05-9d3e-d5057335e694/what_does_ed_mean_on_a_speed_queen_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a4d0332-ff22-4190-9e18-374527d700e2/1996_polaris_magnum_425_4x4_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/toeic_grammar_exercises_with_answers.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF694 5272 bytes
SHA-256: cb5790b9b13b37a007754d0f8d611634f38aa570fb2d4c12bf3bfbb4498c93d5
font_01_sfnt_off00010888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 10932 bytes
SHA-256: a6532b6634d59a4c9fe3b0bd883aa74629ae0bb9916695d1be8187a8041e162b