Malicious PDF — malware analysis report

Static analysis result for SHA-256 828d306df6caaca5…

MALICIOUS

PDF

91.3 KB Created: 2021-05-05 13:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1ea5ce88d308882b0e7b8eb3d617305e SHA-1: 46f5f532c407a6dc22139ead8ade0dfba3a119bc SHA-256: 828d306df6caaca5133e901957d4d579874ba66e599afeec110bc29d3e3a24a2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to lead users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=how+to+find+vertical+cross+section PDF link annotation
    • http://ruvetimoroneb.iblogger.org/compare_and_contrast_the_lightning_thief_book_and_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/nisosawero/ShiELid/hideaway_bed_ideas.pdfIn PDF document text
    • https://dufelawukada.weebly.com/uploads/1/3/2/6/132682042/9392881.pdfIn PDF document text
    • https://cdn.sqhk.co/lovojekaboxi/hjcGhjV/bowim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500670/normal_603e73f4b7df2.pdfIn PDF document text
    • https://cdn.sqhk.co/bipujawojeli/cifAFhf/sas_zombie_assault_2_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sabiwizi/iiogfjb/98351580466.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383699/normal_602ad782974da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416495/normal_6014900bf11e8.pdfIn PDF document text
    • https://ridakikasidom.weebly.com/uploads/1/3/0/7/130739592/6206088.pdfIn PDF document text
    • http://fefuzebamag.iblogger.org/chromic_acid_anodizing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446494/normal_6052d5ad6c0ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_6069e3508ffaf.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxomawelej/Hid0Fhc/40992061223.pdfIn PDF document text
    • https://cdn.sqhk.co/zegareguw/cgghcgd/bowakanakazisomutagus.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/Zijiijj/100_days_zombie_invasion_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/jjFgdhi/inside_out_2015_apa_citation.pdfIn PDF document text
    • http://dokolifaritib.22web.org/28643364655.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_01d79b54cc7c4dd19d18a2fe908ac28f.pdf?index=trueIn PDF document text
    • http://sejedusodumevu.epizy.com/komplikasi_angina_pektoris.pdfIn PDF document text
    • http://sigafuveno.epizy.com/essential_words_for_the_ielts_download.pdfIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_7c9fc50fa8c848c8842842620484299d.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_off00012864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12864 5128 bytes
SHA-256: 12d81119d8e5056464af62f64769d487f6f3dfd99f623e4c386451d6e1c29562
font_01_sfnt_off000139f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F8 11076 bytes
SHA-256: 9b7f946b7dce8248f5cfbd37b95b9970dced6568ed7eb5d66b4f6e258b70d2f4