Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffbaffd7c604ccd0…

MALICIOUS

PDF

87.5 KB Created: 2021-03-25 14:26:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a5fc8bc935c70fdd560053ab649be25 SHA-1: d8f9cfb486bfbae7121025207f7af4a933320a93 SHA-256: ffbaffd7c604ccd009d4e52dec8a3b3efee91ea814061ada4486c9cfff420e36
126 Risk Score

Malware Insights

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

The PDF file contains multiple external URIs, with one specifically pointing to a URL designed to look like a search result for 'mainframe computer definition'. This URL, along with others hosted on disposable domains, suggests a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://kuzutuzo.ru/strik?utm_term=what+is+mainframe+computer+definition
    • http://nijubuwuw.iblogger.org/cisco_dvr_8742hdc_manual.pdf
    • https://cdn.sqhk.co/vumuwilaj/bhbhbi4/64149438472.pdf
    • http://piwudev.iblogger.org/tibco_business_studio_concepts_guide.pdf
    • http://wukimokoled.iblogger.org/free_english_classes_in_melbourne_fl.pdf
    • https://cdn.sqhk.co/kisesawaropo/hiZjdig/kidubixuzotilateze.pdf
    • http://nejesekepub.22web.org/brainstorming_visio_template.pdf
    • http://kowubowawij.iblogger.org/34270904152.pdf
    • http://xabisafeb.22web.org/87728144642.pdf
    • https://cdn.sqhk.co/wajidafix/eifjjNh/2803947349.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/kefodek/adobe_photoshop_32_bit.pdf
    • http://vomovawesojuti.epizy.com/simple_household_budget_spreadsheet_uk.pdf
    • https://uploads.strikinglycdn.com/files/c3e45b95-9f0e-4903-bd0a-f928056f11e6/laxapezixetogomanega.pdf
    • http://mozakolatipuwa.epizy.com/rikki_tikki_tavi_plot_line.pdf
    • https://s3.amazonaws.com/daraniwekamidir/pebujogizakiz.pdf
    • http://gapisoga.rf.gd/medicinal_plants_2017.pdf
    • http://sizixezaratog.rf.gd/63072147019.pdf
    • https://uploads.strikinglycdn.com/files/140f6ee3-2088-49ce-95fc-761468e785f1/timex_indiglo_leather_strap_watch.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c82.bin
f6bc6a0fcfa3ec3afe744e4939698f8040c1e2f48fc6379cb67d896c312c27d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C82 5260 bytes
font_01_sfnt_off00011e3c.bin
9304a5727fd3512fcaf180b805a4ae782a0a901d29b2aebc357b5985c9ebb043		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3C 10744 bytes
font_02_sfnt_off000142dd.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142DD 4324 bytes

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