Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4fc149255ac28b…

MALICIOUS

PDF

75.7 KB Created: 2021-04-29 22:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0cd38fff980b9e0013c7c1544ae89f70 SHA-1: 37a42c3c3f844c8f6835db107a8e203d021e2d18 SHA-256: 1a4fc149255ac28b2843ee38b7483bba7f57d8936f9cd5fd8a4cde30425453fc
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=the+trials+of+apollo+series+pdf PDF link annotation
    • https://cdn.sqhk.co/menasimax/roifhew/24000628782.pdfIn PDF document text
    • http://zugobopepoj.sportsontheweb.net/gym_workout_schedule_for_beginners_with_pictures.pdfIn PDF document text
    • http://gixuloponij.mygamesonline.org/wozoje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493589/normal_5ffd03a06553d.pdfIn PDF document text
    • https://melejorun.weebly.com/uploads/1/3/0/7/130775242/8957598.pdfIn PDF document text
    • http://silekutum.medianewsonline.com/fmea_example.pdfIn PDF document text
    • https://bofazoxoniwepiv.weebly.com/uploads/1/3/4/4/134454835/d7eab.pdfIn PDF document text
    • https://cdn.sqhk.co/pugepavofu/jtnchgr/7_minute_workout_challenge_app_review.pdfIn PDF document text
    • https://cdn.sqhk.co/sewetotab/dWH2Ahb/basketball_games_for_android.pdfIn PDF document text
    • http://wimuzawoxi.getenjoyment.net/underwater_photography_coffee_table_books.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471106/normal_60262c58b7a8b.pdfIn PDF document text
    • https://bobiputab.weebly.com/uploads/1/3/2/8/132814039/8529092.pdfIn PDF document text
    • http://gugezebaz.mygamesonline.org/376168661.pdfIn PDF document text
    • https://cdn.sqhk.co/gipekoma/aidiaFX/6040502795.pdfIn PDF document text
    • https://linezajokopu.weebly.com/uploads/1/3/4/6/134629872/vezulivew.pdfIn PDF document text
    • https://rikolalevagamer.weebly.com/uploads/1/3/1/1/131164452/0d9cb337.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rabelame.atwebpages.com/musin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdf106fe-e3c4-4de3-ac66-d6379d8bf9ee/xakabagalijepikuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96747873-d9b6-492a-9dec-78891c0c61a6/volume_of_cylinders_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c823113a-1669-4440-886f-83637f729703/personajes_secundarios_de_un_mundo_feliz.pdfIn PDF document text
    • http://fowimifefezujo.myartsonline.com/prince2_methodology.pdfIn PDF document text
    • http://xepatodop.onlinewebshop.net/causes_of_the_american_revolution_reading_comprehension.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a18604-6f5d-4ece-9457-26aa62a69cab/electronic_air_cleaner_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df38640d-016a-4b87-af56-5ac9625a4628/92635101300.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_off0000ec12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC12 5080 bytes
SHA-256: 2e280db0498b5a7d4cf405613019ec9a4e7c4007e003222ccb99d860246bccc0
font_01_sfnt_off0000fd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD52 10460 bytes
SHA-256: 2c7164bdfa3bfdfe35d04407bc3e07e08eca67593e8a76ba7cd94a8fa2d80d17