Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ceb0824e3d2085…

MALICIOUS

PDF

90.8 KB Created: 2021-02-15 13:21:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c136960b50f9fb256b72976099d4fbbc SHA-1: 7212dd374381416391b4b648544b6efc49d6e962 SHA-256: 13ceb0824e3d20856306800f26d3a1941ac88d6d01b0413debef67ad220ef6fa
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with multiple external URIs pointing to suspicious domains. The document body, though heavily obfuscated, contains references to 'All souls trilogy book 3 summary' and 'wkhtmltopdf', suggesting a lure to disguise malicious links. No scripts were extracted, but the presence of numerous external URLs indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=all+souls+trilogy+book+3+summary PDF link annotation
    • https://sesanejaw.weebly.com/uploads/1/3/1/4/131407178/nodoruvidixugumim.pdfIn PDF document text
    • https://rixutabenenik.weebly.com/uploads/1/3/4/4/134498467/jatuwesu-zipiri-binijited-sunepoxim.pdfIn PDF document text
    • https://jomaredavox.weebly.com/uploads/1/3/2/3/132302995/wajotugixuzuk_sexugopivowex.pdfIn PDF document text
    • https://voxomusixexuso.weebly.com/uploads/1/3/4/8/134851372/xawis.pdfIn PDF document text
    • http://appletopshop.ru/79098725758thny7.pdfIn PDF document text
    • http://all-host.site/vue_js_component_template_filey8fgg.pdfIn PDF document text
    • http://bilabugova.iblogger.org/wuretasizipababoxuv.pdfIn PDF document text
    • https://degegoza.weebly.com/uploads/1/3/0/8/130873855/topanemi.pdfIn PDF document text
    • http://kemytbok.xyz/42233948829kila9.pdfIn PDF document text
    • http://hurricane1.space/animal_games_3dcxie2.pdfIn PDF document text
    • https://veraroligesabo.weebly.com/uploads/1/3/4/3/134377370/3927321.pdfIn PDF document text
    • https://jovonawokemurif.weebly.com/uploads/1/3/4/6/134678447/4347227.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
    • https://s3.amazonaws.com/xirixepo/new_informer_song_remix.pdfIn PDF document text
    • http://nabajorugum.rf.gd/lonaligepefajutabun.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/pijumarikujow.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/brother_sewing_machine_manual_sq9050.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/borderlands_3_xbox_one_performance_fix.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9E 5120 bytes
SHA-256: 0edff6048a974840a36d54a41d60dcef685a09622295f6923baebb3f0afb725c
font_01_sfnt_off00012d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D12 10316 bytes
SHA-256: b66e173133073cae03880b81b0072813a9964ef19853e30b7797e0aa31b84fb4
font_02_sfnt_off00014fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FAB 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

Open this report in the interactive analyzer, or submit your own file for analysis.