Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb713b3ca9aee8c…

MALICIOUS

PDF

87.3 KB Created: 2021-02-25 01:26:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 446d46a3d4d3db57e317f7ed73c15f4f SHA-1: d5061704199ba6a0ffb52674a075bc36726643ce SHA-256: 0fb713b3ca9aee8c41b19fd3447d5d75122dfda486501dca0a59db7c86af835d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured to appear as search result links, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of external URIs and link farm heuristics further supports the conclusion that this document is designed to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=best+price+for+cuisinart+griddler PDF link annotation
    • http://stylecurtains.com/xobexixagupirm7q9o.pdfIn PDF document text
    • https://zevuraze.weebly.com/uploads/1/3/4/4/134440796/05a359cd0ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498324/normal_603236b317493.pdfIn PDF document text
    • http://wonnaturila.space/zoom_h2_manual_deutschimhkq.pdfIn PDF document text
    • http://magicwoolshop.com/tumuguzajilizuziwa406bu.pdfIn PDF document text
    • http://kernig.online/reflection_mulan_partituraa0v0f.pdfIn PDF document text
    • http://prostotit.site/procesos_cognitivos_basicos_y_superiores_resumenl743h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383128/normal_6029c8967a1a8.pdfIn PDF document text
    • http://sacredname.ru/468175443534p74m.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/how_to_get_share_the_wealth_cards_in_life.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/79292039483.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449774/normal_5fcd6f5217c93.pdfIn PDF document text
    • http://ryursew.space/70405499342jcgie.pdfIn PDF document text
    • http://docita.fun/barcarolle_guitarq5yd9.pdfIn PDF document text
    • http://allieshouseofhope.com/photoshop_cs6_for_mac_crackove4e.pdfIn PDF document text
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/50675c13afc3eb.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://donijexufenu.onlinewebshop.net/kayla_itsines_ab_workout_cosmo.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/how_to_light_pilot_on_williams_wall_furnace.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70F 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off000107f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F6 5256 bytes
SHA-256: 86f8af1c2439a4be917a23e2aea800c21d98b9774090858052f1b3d0555327bd
font_02_sfnt_off000119e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E6 11484 bytes
SHA-256: 291ef61a7a6efa666361a7489103356155b65e267928197df751fb284b015345
font_03_sfnt_off000140da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140DA 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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