Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c34903490a4858b…

MALICIOUS

PDF

85.2 KB Created: 2021-04-05 21:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 433e06ba8f174df93511d9ee6778c007 SHA-1: da917985f3dc0958de4eb9ba81987fb4758e082a SHA-256: 0c34903490a4858b4dcb9e35295274296099f0dfc6ecc7ac25a6e33643e991a9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection further corroborate its malicious nature. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://kuzutuzo.ru/strik?utm_term=wishful+drinking+book PDF link annotation
    • http://sportita.fun/yoga_asanas_books_free_download_in_telugujor9e.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/ghhFjif/superhero_coloring_pages_printable.pdfIn PDF document text
    • http://gulibej.22web.org/20904887760.pdfIn PDF document text
    • http://hackins.site/time_management_tips_for_teachers_ppt2lrqz.pdfIn PDF document text
    • https://cdn.sqhk.co/xozirijor/qW5hfic/cabin_crew_cover_letter_format.pdfIn PDF document text
    • http://rasprodavaika.ru/lodiwodufobogejojaneugi7p.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/ihaii3L/xafiwugetumewexe.pdfIn PDF document text
    • http://gramnews.xyz/astro-_vision_lifesign_horoscope_software_freec5ss4.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://uploads.strikinglycdn.com/files/ad70962e-85ff-49c7-9364-f519e6f5eeea/the_hound_of_the_baskervilles_sherlock_holmes_summary.pdfIn PDF document text
    • http://goxabobuti.rf.gd/arthritis_uk_shoulder_pain_exercises.pdfIn PDF document text
    • http://penabak.epizy.com/puzalapixipolaborodesik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f9801b7-5732-469e-9768-ec665926078a/where_can_sex_offenders_live_in_nj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74f867ff-d875-48e1-b102-ee3bdb397808/13239469974.pdfIn PDF document text
    • http://banugigo.epizy.com/call_of_duty_4_pc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/jenamojefirefegojij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af0bc7a-55ed-473a-833f-50a1295e66b8/vabexepepafobogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c49951db-b175-499c-82e4-a7a475559dad/fopini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8328e5e0-5cbb-4a56-9d61-9dc10017833e/tosagubotofagumogineriro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/753bd301-464e-41e9-ad5f-53a7c65dc2b9/endocrine_system_worksheet_answers_section_b.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/agra_city_map.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/brahmotsavam_full_movie_sinhala_subtitles.pdfIn PDF document text
    • http://virixufagew.rf.gd/70567062330.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_off000103f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F2 4860 bytes
SHA-256: e161b841d9751ecc0dbaa00c08919d93141d5595405811140b340e3a7a0e0b6e
font_01_sfnt_off0001145d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145D 10820 bytes
SHA-256: 2fd53a2903be2b5691c7cdae78886ecb292c892bcc99f63d19cd5c308d9a8d4c
font_02_sfnt_off0001392d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e