Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c85b4acc7bf700e…

MALICIOUS

PDF

81.0 KB Created: 2021-03-24 06:00:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d5ac0b882027cd0955fb59f2082c6180 SHA-1: 2b7d0a0be944793ca5cc5ff6bca9c0ff78149e58 SHA-256: 1c85b4acc7bf700e7a592e940e20cae529380905e81b67adcd3534f0fab3afd2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=john+deere+750+tractor+horsepower PDF link annotation
    • https://cdn.sqhk.co/zitiwofiru/ijOjjr9/dish_anywhere_app_for_windows_10.pdfIn PDF document text
    • http://sdfafq.info/canoscan_lide_120_driversz7fk7.pdfIn PDF document text
    • http://robertferrell.net/sobinejolovoralabnn8t.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/crxCLzp/80251414595.pdfIn PDF document text
    • https://cdn.sqhk.co/vomemubevu/h6jdgdW/fall_race_3d.pdfIn PDF document text
    • http://jesofoma.getenjoyment.net/56018260726.pdfIn PDF document text
    • https://cdn.sqhk.co/ratufewebu/bif13dN/hero_brave_battle_of_dragon_mod.pdfIn PDF document text
    • http://fokenatefadef.iblogger.org/61382588519.pdfIn PDF document text
    • http://neuroncraft.online/maggie_mistal_interview_with_denise_richardson_singer6hctr.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/fidobakipivogit/baofeng_uv-5r_8w_review.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/gizome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e24eaa0-ed66-46db-8f65-5139ba5f9510/how_to_pronounce_ivanna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1efe9726-884f-4e63-a4d9-e4c2f2e40105/10159841151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbbcfbc4-6802-49d1-acf8-789c7f32414a/mogonunenivox.pdfIn PDF document text
    • http://fozozip.onlinewebshop.net/37934650411.pdfIn PDF document text
    • http://degefoxovovi.epizy.com/financial_reporting_cpa_exam_review.pdfIn PDF document text
    • http://tuzikarowom.epizy.com/horror_movies_in_tamil_2019.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 5556 bytes
SHA-256: 85daf89d32167c2fd1f83edcb4031ee3b6b49f02275630f4d58931f8dabf8644
font_01_sfnt_off00010e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E52 12412 bytes
SHA-256: 843c4491a56711acbe4bbe1f2fcc62f1aa47da046eb40a10922df312b44a09a9

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