Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a14b170b7300c9…

MALICIOUS

PDF

80.0 KB Created: 2021-04-19 07:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a160ed353817a660497e9ff650685cca SHA-1: b8143e4c014649b91a7a5232475b99c4e63c7c90 SHA-256: d8a14b170b7300c9751aa41f212389ac95f042a284aefa307988bd40bc269525
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or scamming purposes. The document body, though obfuscated, contains a query that serves as a lure to the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=what+size+crate+for+mini+dachshund In PDF document text
    • https://cdn.sqhk.co/gekakisoduvo/TWgSjfM/recargas_a_cuba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481676/normal_60672d8b42728.pdfIn PDF document text
    • http://xupulakikovuxo.mypressonline.com/calisthenics_workout_routines_full_body_transformation_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/ighG1hb/2955134599.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/i4M4F2F/dragon_ball_pipes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377925/normal_5ffabe9a5ebba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444869/normal_600728170ccfd.pdfIn PDF document text
    • http://mazejofeg.mygamesonline.org/jubojojejaj.pdfIn PDF document text
    • http://ninuwekevap.scienceontheweb.net/diffusion_process_in_ic_fabrication.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/Eiiifgi/vpn_private_network_download.pdfIn PDF document text
    • http://wigasubuga.22web.org/duxufugawibojuvomi.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/hfNhczT/roblox_monster_battle_aura.pdfIn PDF document text
    • http://pegixudovojap.iblogger.org/46712941255.pdfIn PDF document text
    • http://kewatupu.scienceontheweb.net/jack_reacher_tv_show_netflix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wosazexawejusu.rf.gd/camtasia_7_tutorial.pdfIn PDF document text
    • http://vikibolo.epizy.com/lunitenudosamumirum.pdfIn PDF document text
    • http://nisetekotixob.myartsonline.com/acidosis_metabolica_causas.pdfIn PDF document text
    • http://lojosikol.epizy.com/gejos.pdfIn PDF document text
    • http://lowuguja.myartsonline.com/takoxi.pdfIn PDF document text
    • http://vurasoda.rf.gd/avira_free_antivirus_2019_offline.pdfIn PDF document text
    • http://bikilut.epizy.com/pan_card_correction_online_application_form.pdfIn PDF document text
    • http://vuxalono.epizy.com/biology_campbell_reece.pdfIn PDF document text
    • http://dafukip.myartsonline.com/tilapia_fish_farming_guide.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_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 5292 bytes
SHA-256: 495851fb71d4e335abf901c4ea9a0a8dd745a3b50a957a5723d12c09e6f35ebb
font_01_sfnt_off00010b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B30 11116 bytes
SHA-256: 77a4b67e1f05906e13c337c629ec2f2d2f7345233b910e4bdc5bed9184f60a24

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