Malicious PDF — malware analysis report

Static analysis result for SHA-256 76055a181571410b…

MALICIOUS

PDF

80.2 KB Created: 2021-04-19 23:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d08e06436a4c829b06376899edc8e045 SHA-1: dd04b9ca9b4228231516d00bc832f7e3253ae8c4 SHA-256: 76055a181571410b3c123ceec7f40a407cc9a14957feb6fe6b1e08dc683d243e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body, though partially corrupted, contains text related to setting a watch, likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=jak+ustawic+zegarek+g+shock+5081 PDF link annotation
    • http://esmoney.site/bivagsbsvn.pdfIn PDF document text
    • https://wipigoxexidon.weebly.com/uploads/1/3/2/6/132682030/vezareli.pdfIn PDF document text
    • http://nigma24invest.online/jidov0xj94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495409/normal_60117666d3207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527108/normal_604627edd3f1c.pdfIn PDF document text
    • https://meboguvogo.weebly.com/uploads/1/3/1/4/131437667/ninezanudex-gifaj-pejufi-didawedijogo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453100/normal_6013a30297d66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452624/normal_600652b000e5d.pdfIn PDF document text
    • http://aduo5.online/tim_lahaye_temperament_test_online0xj81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391331/normal_605ad54e034d1.pdfIn PDF document text
    • http://shmelev.pro/32296545663f6xii.pdfIn PDF document text
    • https://bizavurodetilu.weebly.com/uploads/1/3/4/3/134391156/9847056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475217/normal_601e3f0881359.pdfIn PDF document text
    • http://instapriz.site/what_chilean_island_inspired_the_story_of_robinson_crusoegof6a.pdfIn PDF document text
    • http://gimatadokij.mygamesonline.org/ronoka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408002/normal_600e4093294bf.pdfIn PDF document text
    • http://pixizosusonaxij.sportsontheweb.net/business_communication_process_and_product_9th_edition_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464862/normal_5fefbe4e6d292.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bujitajaxo.epizy.com/revenue_model_powerpoint_template.pdfIn PDF document text
    • http://varogofef.epizy.com/overtone_crystal_oscillator.pdfIn PDF document text
    • http://zulojazivuvuk.epizy.com/how_to_import_pictures_from_google_photos_to_iphone.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_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 5736 bytes
SHA-256: 6ef17be0939bcf77e224215f1b421fc44f275b02550cd15cb3699af01d5f2d8c
font_01_sfnt_off00010b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5A 12168 bytes
SHA-256: cd483131caadb725e2429e4953db707b24a7a171cbc754c8a6b0538cf6c4acb0

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