Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b35ace9ca63b6e8…

MALICIOUS

PDF

72.5 KB Created: 2021-06-06 20:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cb0bfee7197c415de1af12bdfac9f9f2 SHA-1: e086df2702e60779ab8e4d3906fa4559589ff48d SHA-256: 9b35ace9ca63b6e84e58a7ae5bbfe2c5ba784775c1a243a4bd55eacde8163641
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://chcial.ru/pbw?utm_term=space+ore+idle+clicker+mod+apk+1.9.1 PDF link annotation
    • https://xexonuza.weebly.com/uploads/1/3/4/3/134305788/xidalufede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376857/normal_605fb58a7b8b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491155/normal_5fd9866976ae2.pdfIn PDF document text
    • https://sobanuwutotamiw.weebly.com/uploads/1/3/4/1/134131644/9941760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485698/normal_6059a982f408d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giwupiraride.pbworks.com/w/file/fetch/144624639/how_to_make_history_project_class_12.pdfIn PDF document text
    • http://gatunam.pbworks.com/f/melenokanozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/518a86ae-e7c9-4d35-946e-8fdee52ecf36/gujaxurimobili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cb931c5-3d80-456c-b270-d64afd465650/solving_literal_equations_worksheet_doc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/246ab905-910a-4754-964b-b5e3a9f6d73d/8_ball_pool_ios_hack_money.pdfIn PDF document text
    • http://bujolajoxek.pbworks.com/w/file/fetch/144529629/9223121189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7524037a-2c3e-49d9-8783-6fa64231b692/neliputosojezaragopoda.pdfIn PDF document text
    • http://fijinatuzut.pbworks.com/w/file/fetch/144606243/hamilton_beach_flexbrew_49954_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b93092c-c50b-4fc0-ad29-228a3660dec7/fezumanabujabasakagumemin.pdfIn PDF document text
    • http://vogituvu.pbworks.com/f/89390760797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12884cf0-4a90-4e7c-8808-21b471fff857/lakshmi_kubera_gayatri_mantra_lyrics_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f5d3e75-3f31-46fc-89f8-96e144b48116/lezisudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afdae4db-e19c-417c-8299-eaa8609d2250/test_review_right_triangle_trigonometry_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24c82ea7-1d05-4a74-aec4-d8b4e7cc5044/56019047122.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/50753138663.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_off0000dd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD30 5448 bytes
SHA-256: c18c28af946d17703b4f82b899d2c8662a399454abf0b951e9af093a418be0d0
font_01_sfnt_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 10828 bytes
SHA-256: 9d49b797658ed2814cfb3a0baf83bf86b50477e7dd897a74a9e0a072cb58dc06