Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6833fb44f9c0a3…

MALICIOUS

PDF

80.6 KB Created: 2021-04-10 16:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ec42df48f1ea87d8880bdb6d017d942e SHA-1: fb0ac7d4cbcb6b8ecbb417ad001146773ef0809a SHA-256: 3b6833fb44f9c0a3e0507f0b2fba6caf957b46a8e097aaeb326123b941eebcc9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially malicious or low-reputation hosting. While no scripts were explicitly extracted, the presence of external URIs and the link farm nature strongly suggest an intent to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://dugedepap.ru/strik?utm_term=the+endless+trench+2019+movie PDF link annotation
    • http://bugilinupapud.mygamesonline.org/algebra_1_volume_1_teacher_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496001/normal_601da1607b859.pdfIn PDF document text
    • http://startbastar.online/how_to_reset_symbol_scanner1jg1p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369516/normal_5fe5d3c9d92cc.pdfIn PDF document text
    • http://energytik.net/99596677869yv3m3.pdfIn PDF document text
    • http://kevakigev.medianewsonline.com/arab_spring_books.pdfIn PDF document text
    • http://it50discount.pro/zusatuvetobakasomowumola1lixg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383687/normal_602eb326453b3.pdfIn PDF document text
    • http://wubesababo.iblogger.org/36379537808.pdfIn PDF document text
    • http://gudokav.sportsontheweb.net/89696515721.pdfIn PDF document text
    • https://simazilojimi.weebly.com/uploads/1/3/5/3/135345327/807f06c441bd.pdfIn PDF document text
    • http://mekomob.getenjoyment.net/harry_potter_and_the_chamber_of_secrets_book_bloomsbury.pdfIn PDF document text
    • https://tuwakunasuj.weebly.com/uploads/1/3/0/8/130874309/wofamexefifojek.pdfIn PDF document text
    • https://gilurabad.weebly.com/uploads/1/3/0/7/130775641/puwugamunekovu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372358/normal_606cd3260d6e2.pdfIn PDF document text
    • http://getsalle.xyz/sowegeleu9u72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375694/normal_5ff7b6df902c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370286/normal_5fcb39662e218.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471690/normal_5fdd105a7609b.pdfIn PDF document text
    • https://zopiwaseka.weebly.com/uploads/1/3/0/9/130969839/kezirivixaz_ditaputemixadul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387589/normal_604ff2ec4ddc7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bopewexe.onlinewebshop.net/valoruferupagusezuke.pdfIn PDF document text
    • http://jijetebum.epizy.com/homophones_sentences_worksheets.pdfIn PDF document text
    • http://tewamenuve.rf.gd/createspace_cover_design_template.pdfIn PDF document text
    • http://muzokezebo.rf.gd/11122130355.pdfIn PDF document text
    • http://lasuwutiganije.rf.gd/24765636836.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_off0000f9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B8 5460 bytes
SHA-256: 8189a739ed52170db533c2563c2398be4d00b3cea9dc39a06d5ed8b30af39608
font_01_sfnt_off00010c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2E 11940 bytes
SHA-256: c9598b24e0bd1bf962400feefb227a0de9eecb6034cc195ace0bc8be2bb760a5