Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f19c0e725f4b95…

MALICIOUS

PDF

71.5 KB Created: 2021-06-09 07:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d02771fb0fe9340bcf1a0c29b494a992 SHA-1: 33baf7bd765d1fc23b24da12c82d292ad6a94953 SHA-256: a7f19c0e725f4b9560ce0e98e604cc518956bdd15d08fcb72c7b95e4e6cc4f61
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to disposable hosting and one specifically to 'coretry.ru', strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to a periodic table, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://coretry.ru/pbw?utm_term=periodic+table+with+metals+and+nonmetals PDF link annotation
    • https://danizejoj.weebly.com/uploads/1/3/5/9/135990884/jisabomujolekisige.pdfIn PDF document text
    • https://demuvejujewik.weebly.com/uploads/1/3/4/0/134042515/paxutezerolu_deved_noxugalekisu.pdfIn PDF document text
    • https://vemideluguzuni.weebly.com/uploads/1/3/4/6/134680431/pugazexiteximakepitu.pdfIn PDF document text
    • https://retotanenumu.weebly.com/uploads/1/3/4/0/134017544/gudozumivofur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zixereves.pbworks.com/w/file/fetch/144534318/fubiwosamezetuvuxo.pdfIn PDF document text
    • http://pijipusap.pbworks.com/w/file/fetch/144478959/25541827595.pdfIn PDF document text
    • http://fixunomavow.pbworks.com/w/file/fetch/144712707/ejercicios_de_regla_de_tres_compuesta_mixta_resueltos.pdfIn PDF document text
    • http://gijutexamuwa.pbworks.com/w/file/fetch/144674496/is_aware_a_tone.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/how_does_scout_describe_mrs_dubose.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/f/genetics_in_medicine_nussbaum.pdfIn PDF document text
    • http://lalunanefiw.pbworks.com/w/file/fetch/144625017/3750100340.pdfIn PDF document text
    • http://pupowivala.pbworks.com/w/file/fetch/144426189/whats_the_code_for_get_crushed_by_a_speeding_wall_2020.pdfIn PDF document text
    • http://komogabovuwa.pbworks.com/w/file/fetch/144587934/fit_body_boot_camp_workouts.pdfIn PDF document text
    • http://tereburokofe.pbworks.com/w/file/fetch/144764109/why_they_banned_the_book_of_enoch_make.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/f/restless_2012_movie_download.pdfIn PDF document text
    • http://biduzoku.pbworks.com/w/file/fetch/144614199/13050237598.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/f/74610783452.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_off0000db0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 5412 bytes
SHA-256: 25f2d140af8449c64702755311d2344d05d6ff54c0317f1528ebb482dafd3003
font_01_sfnt_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 10272 bytes
SHA-256: d2ea20211ac4a45932e0e9ce3ec77c6f75d593ccbb4288ee8ffd6166f0eacedb