Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5c7d68433f080d…

MALICIOUS

PDF

77.1 KB Created: 2021-03-21 07:25:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 950261c71e8a66eb9b02b2fbf666997c SHA-1: 99aa3c47aea55c15f102bd56355f5bddd852fc3e SHA-256: 4b5c7d68433f080d3cb9588f1b35cbd376d02187ccd1dc65c63259ac6b6adc31
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://dafemum.ru/strik?utm_term=how+to+charge+a+pocket+juice+20000mah PDF link annotation
    • https://sixewamunid.weebly.com/uploads/1/3/4/4/134472099/69a68.pdfIn PDF document text
    • https://midatapeb.weebly.com/uploads/1/3/1/0/131070166/9092455.pdfIn PDF document text
    • http://teasmall.space/jutazafugenodufu6mvwp.pdfIn PDF document text
    • https://gazobibulome.weebly.com/uploads/1/3/4/7/134775133/vusiwox-diwagopup.pdfIn PDF document text
    • http://temilops.xyz/77375586216qo03u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412382/normal_5fc744120718c.pdfIn PDF document text
    • http://getporte.xyz/what_is_a_network_plus_certification5b7vi.pdfIn PDF document text
    • https://xeluxujuw.weebly.com/uploads/1/3/4/4/134438775/muzumixe_bakojajarubo.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/gHgiuhd/cross_roads_isd_football_schedule.pdfIn PDF document text
    • https://xemojunaxumig.weebly.com/uploads/1/3/4/2/134265853/xosakufud.pdfIn PDF document text
    • https://cdn.sqhk.co/sewitakin/hgiid8f/mera_bhola_hai_bhandari_song_pagalworld._name.pdfIn PDF document text
    • https://dotozirijekuzo.weebly.com/uploads/1/3/4/3/134315872/ninewutiw.pdfIn PDF document text
    • https://zafivagofe.weebly.com/uploads/1/3/6/0/136011523/pigak_mexapi_sebavisolala.pdfIn PDF document text
    • https://cdn.sqhk.co/fanoxozowupe/3Z9snrj/wirizekonidosubokevawafun.pdfIn PDF document text
    • https://napaxivate.weebly.com/uploads/1/3/0/8/130813999/lodunuva.pdfIn PDF document text
    • http://salonhq.xyz/678494443592ytyg.pdfIn PDF document text
    • http://randname.ru/fortnite_song_once_i_was_7_years_oldomi5o.pdfIn PDF document text
    • https://dalulasu.weebly.com/uploads/1/3/4/4/134493325/tewukarulovug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453344/normal_6018ad5733214.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobita/0gfjggg/canola_council_swathing_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_2c7ac402765248f790ff4902f745665f.pdf?index=trueIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_e09a1bd6109c44fda24da3eacb6f6fe4.pdf?index=trueIn PDF document text
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_a2516e2c5a28459485d08c9f3373300d.pdf?index=trueIn PDF document text
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_2c6d8e3edd004899b17f5317c96ad8e6.pdf?index=trueIn 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_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 5604 bytes
SHA-256: 433521f112802b5afb0edf01192ed446b35bd6b364ce1222a9ad413e4dc610fc
font_01_sfnt_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 10544 bytes
SHA-256: c7583628982081a40057c9ca952b8ce78ec155f99f9bf77c861cc243faade9f8