Malicious PDF — malware analysis report

Static analysis result for SHA-256 e199fac3eb7dd693…

MALICIOUS

PDF

69.4 KB Created: 2021-04-05 09:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 61db28cff357284881e0b6921d7853a7 SHA-1: 9eb50782aa0854cd11ba6911c983ebb2245d22d4 SHA-256: e199fac3eb7dd693bcda9ada38c332248c708561fafaf4b8b7d462fd535ce157
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://jottigo.ru/123?utm_term=written+numbers+in+english+worksheets PDF link annotation
    • http://marinarus.space/kenwood_ddx371_backup_camera0mq16.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/gn5igjc/fasafadejujusadonaxal.pdfIn PDF document text
    • https://tekaxudifen.weebly.com/uploads/1/3/5/9/135992886/juzosimitiwizisanox.pdfIn PDF document text
    • http://vereffka.xyz/french_revolution_class_9thqvmj8.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://wusator.mygamesonline.org/kawugafuwomo.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/hchdriC/65458062389.pdfIn PDF document text
    • https://jimurapixow.weebly.com/uploads/1/3/5/3/135399705/156265.pdfIn PDF document text
    • https://tuxupurevulivi.weebly.com/uploads/1/3/0/8/130813143/juzuwojel-kowogaxi-xamonajovaxep-renupefamuku.pdfIn PDF document text
    • http://nyvelsets.online/48639436200n5v62.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/jbjbvXq/mini_rc_high_speed_racing_remote_control_car.pdfIn PDF document text
    • https://nifusesoporiw.weebly.com/uploads/1/3/5/3/135309858/5739508.pdfIn PDF document text
    • http://duzusedolatepe.mypressonline.com/medical_tourism_dissertation.pdfIn PDF document text
    • http://septiki-rf.website/magoletimusao0x89.pdfIn PDF document text
    • http://7lessons.website/a_levels_biology_noteswncwt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fibesezati/kenmore_series_600_washer_high_efficiency_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/k30_vs_k20_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/kubla_khan_bangla_meaning.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_off0000d4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A0 5196 bytes
SHA-256: d52ae51bf86a36548dc7ac946dc3d578de94e3d708dfdca1fb6ad6cd80f2b9f7
font_01_sfnt_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 9912 bytes
SHA-256: f4f2496aa79ba166c4c3e07d2aa4f7d0023b9f6b40d430debcd220468ccb5800