Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b4e5a24f90c36a…

MALICIOUS

PDF

76.4 KB Created: 2021-03-12 15:43:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e9b6138f5fc325d5e2b51edcbd4d0054 SHA-1: 99a4e5cb38440a1be0e0accfe4bc154f9fe4a8b5 SHA-256: 88b4e5a24f90c36ad31910193866ce8f0a4c6b489e2c8730d9c92bd2f6306ee2
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, many of which point to disposable hosting, suggesting a link farm designed to distribute malicious content or phish for information. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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 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.
  • 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://yafferge.ru/award?keyword=jadual+caruman+sip+perkeso+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4458833/normal_60463947672c2.pdfIn PDF document text
    • https://moluzepin.weebly.com/uploads/1/3/1/8/131856103/beluvelizerab_tesuvebupife_xafosovoxali.pdfIn PDF document text
    • https://muduzefob.weebly.com/uploads/1/3/4/0/134018051/06179d271f398.pdfIn PDF document text
    • http://noxokolozoj.iblogger.org/baby_shower_invitations_templates_free_for_word.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411498/normal_5fc6059f251c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405186/normal_5fe6fbc52b5d8.pdfIn PDF document text
    • https://jimuvidagonolab.weebly.com/uploads/1/3/1/6/131636746/tizivesoxatug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384817/normal_602e86f6b48f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379222/normal_60415e08edb91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471252/normal_5fdb8c39017d1.pdfIn PDF document text
    • http://vilajesakere.iblogger.org/basic_mechanical_engineering_textbooks_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392667/normal_6027cdc148069.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kiwusumusi.rf.gd/56469147124.pdfIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_1e292d4da53a4fa6b7ba08e78af2e696.pdf?index=trueIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_b8acf9cbbc904abeabfd7202aa98fc7c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jakujakula/cambridge_english_picture_dictionary.pdfIn PDF document text
    • https://f1bcc07e-4080-488c-b321-e1ddc560d513.filesusr.com/ugd/cac9e4_d741803244054985ac099bf40a684e0a.pdf?index=trueIn PDF document text
    • http://dufijofitaj.epizy.com/mathematical_statistics_with_applications_7th_edition_solution_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/58226704115.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/94149718215.pdfIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_2c960c996042419893195ef4151cebe8.pdf?index=trueIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_52d96d508cfb4950a62b8abcd23e6590.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/guvovigo/jurassic_park_theme_music_free.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_off0000edfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 5356 bytes
SHA-256: 808dbb9889dfdb6157d291650c2450b1ac1a1d1a538b0425366d1658355ce919
font_01_sfnt_off00010022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10022 10496 bytes
SHA-256: 74d8dc7df8f82d10fdc3ea2cf92a4990eb743dd64cb2b157bc7cee9ae2ddc57c

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