Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67f876a22cdc4ff…

MALICIOUS

PDF

72.9 KB Created: 2021-01-31 10:36:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4e106998ac59fbe8212989e0f0e8676d SHA-1: e04a315feece16413b3ff88a54382384ac67de7b SHA-256: f67f876a22cdc4ff1408e0a34b6b853285c1ff850264a710bd329c6b3416ab22
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external sites, many of which are associated with link farms or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment.

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://leonvi.ru/aws?utm_term=dryer+sheets+egypt PDF link annotation
    • http://dovulup.iblogger.org/stickers_for_gb_whatsapp.pdfIn PDF document text
    • http://natgood.space/pmp_exam_prep_8th_edition_updateds54ru.pdfIn PDF document text
    • http://lobomizozage.iblogger.org/hyaluronic_acid_replenishment_sheet_mask.pdfIn PDF document text
    • https://cdn.sqhk.co/tememukafosu/che5je2/baking_recipes_using_gluten_free_flour.pdfIn PDF document text
    • http://pressit.fun/69371128605monvd.pdfIn PDF document text
    • http://hookup154.fun/4607369481091m7n.pdfIn PDF document text
    • http://islta.fun/232678301793wwl4.pdfIn PDF document text
    • https://cdn.sqhk.co/jalizovi/whiahgk/gekagezizuguxurot.pdfIn PDF document text
    • http://tisiner.iblogger.org/44986483480.pdfIn PDF document text
    • https://cdn.sqhk.co/bimeniwog/eWDaigW/zotiwamazofutar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mulukamuzadesew.epizy.com/bailey_and_love_essential_clinical_anatomy.pdfIn PDF document text
    • http://tivapatovike.epizy.com/royal_canin_labrador_retriever_puppy_feeding_guide.pdfIn PDF document text
    • http://kirawolus.rf.gd/95131200445.pdfIn PDF document text
    • http://xikoxevogajub.epizy.com/laravel_carbon_format_datetime.pdfIn PDF document text
    • http://meraxemuvixise.epizy.com/can_t_connect_to_wifi_android_phone.pdfIn PDF document text
    • http://lugopupi.rf.gd/lawn_care_business_card_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65A 4464 bytes
SHA-256: 64a1caabb57498eed12532ae27fa7625c835987dddc826ca062e503888ff894d
font_01_sfnt_off0000e5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A7 10264 bytes
SHA-256: 0aea7a733bed8c100f2e4adebe7550b3dff0695df5e637b0ac93e6ea03d8cf1d
font_02_sfnt_off000108d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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