Malicious PDF — malware analysis report

Static analysis result for SHA-256 720fef3a04b0c697…

MALICIOUS

PDF

76.6 KB Created: 2021-04-06 18:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ba5b02272ab2bb9fd38477f48c6f196c SHA-1: 9743414fa7c67daa954af0c97c137409d02c5a8f SHA-256: 720fef3a04b0c6976bdb61518d666610a10b6373d5958a9f65707426bfb10f63
166 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 0.9997

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://gimoguvi.ru/strik?utm_term=john+grisham+latest+paperback PDF link annotation
    • http://igme.site/manifiesto_del_partido_comunista_de_karl_marx_y_friedrich_engelscg0ao.pdfIn PDF document text
    • http://soldonlittleton.com/peduponejufapiwofipeftkzg.pdfIn PDF document text
    • http://teachersaid.fun/cyberpunk_2077_gameplay_1_hour8ae4o.pdfIn PDF document text
    • https://cdn.sqhk.co/xajegakagiz/aKkJ7ib/46434513971.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxaletadi/ecwijje/sales_negotiation_skills.pdfIn PDF document text
    • http://mnogolidov.xyz/pilipesikumezoxubotegemumtbqhi.pdfIn PDF document text
    • http://ekzo-fruit.ru/pokemon_soul_silver_egglocke_downloafu5ar.pdfIn PDF document text
    • https://cdn.sqhk.co/soziwariru/au0hfNX/xanokegozugupalusunuzanag.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/qbieHOT/red_alert_remastered.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/b675ad76-7a88-435b-8a88-4cd6b259f1bf/35545760525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e52ba39-3cf4-48cf-9591-15cc02999513/97909419430.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/sentry_gun_safe_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02b2f9d0-b54d-41e4-8180-6367133244a8/compare_and_contrast_sign_of_the_beaver_movie_and_book.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/free_comprehension_worksheets_for_year_2_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4465d102-0821-4392-be0c-632f824480a1/6859832505.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/nurutulinimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f0489d9-0db5-4059-aa4d-73d2aae10534/3764378652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6f0f94-5daf-40db-aa78-1311768a5f07/how_to_use_the_karaoke_singing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/how_does_directv_genie_mini_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a58b14a3-4437-41e2-bbd6-e68fb75514c2/soccer_mommy_color_theory_tri_color_vinyl.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_off0000ee2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2C 5540 bytes
SHA-256: 47a52ff619668f3464eec2efc226130c0af07513a75d53504f5c8b40915cb03c
font_01_sfnt_off000100d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D9 10768 bytes
SHA-256: 7fb6acbabe79952c7f05a67d1b4b8b4a9b6878c60c700a4031d4fb41ca970bb8