Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11f99a94e972c3a…

MALICIOUS

PDF

74.6 KB Created: 2021-06-12 04:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 27da47e3f0dd658a541fc8fb5badcb35 SHA-1: db341ac614b6df588123a2d31eee35e04cd5e277 SHA-256: c11f99a94e972c3a5fcd7952cc0f32868db9c2caf358da0ed0e96f8837527800
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, many pointing to link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pistant.ru/pbw?utm_term=tamil+all+album+song PDF link annotation
    • https://rusuligoxajikug.weebly.com/uploads/1/3/4/3/134399392/jizozekuxokoxubasu.pdfIn PDF document text
    • https://ruxamaref.weebly.com/uploads/1/3/4/7/134749336/1318423.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/foriluvawomiv_vulevuj_bomegipudodi_pukunovugigoz.pdfIn PDF document text
    • https://xubikorapaja.weebly.com/uploads/1/3/4/3/134335605/6646218.pdfIn PDF document text
    • https://motazejiwe.weebly.com/uploads/1/3/4/2/134266269/xovorogazek_takami_tilexi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lopofemusun.pbworks.com/w/file/fetch/144617292/kijujomivewaxovizuzu.pdfIn PDF document text
    • http://vogivakazela.pbworks.com/f/new_telugu_movies_download_website__500__0.06__0.45__Low__1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c78bcc3-1346-4b97-b5a8-9dfb67b25e35/20679503423.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/f/matematicas_discretas_y_combinatorias_ralph_grimaldi.pdfIn PDF document text
    • http://kakexigodelo.pbworks.com/f/bupekoxumedawejobopad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69239696-8a48-41e1-a454-b2993c2807a8/fight_club_book_review_new_york_times.pdfIn PDF document text
    • http://nilidix.pbworks.com/f/wukituxo.pdfIn PDF document text
    • http://sebevowan.pbworks.com/w/file/fetch/145080297/3_phase_motor_wiring_diagram_star_delta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/728489d2-37b8-4fdd-b909-e02a9d5538d2/home_interior_design_software_free_online.pdfIn PDF document text
    • http://kivotin.pbworks.com/f/dd_gunslinger_character_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45d46600-eb7f-4d5d-8f7c-ab1880139139/boss_dd_500_u2_settings.pdfIn PDF document text
    • http://jebodigezev.pbworks.com/w/file/fetch/144975309/codex_necrons_9th.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/w/file/fetch/144457956/lidusuj.pdfIn PDF document text
    • http://tezalef.pbworks.com/w/file/fetch/144848676/calculo_diferencial_e_integral_frank_ayres_jr.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/temiso.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_off0000e643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE643 5000 bytes
SHA-256: e913c636214dfafbe168ca8abbd9fd280a5ecd1aee43a9b18ba23315e13864a0
font_01_sfnt_off0000f734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF734 11308 bytes
SHA-256: 9a391b00fce73e9b325fda8741ac040ec530be6601f8cbd7a64fc592c77fb7a1

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