Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68b9816a4aa75a3…

MALICIOUS

PDF

69.3 KB Created: 2021-06-04 20:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fe1eadef25d9a79278857852715e1a5c SHA-1: d91c7d27e79184a1975054248bd6dc8bf3a9eee5 SHA-256: a68b9816a4aa75a3b8c697d86b766d49fbae5f646d928ae8cd505d4bf112ed65
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'seumenha.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'Descubre 1 leccion 3 answers', indicating a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://seumenha.ru/123?utm_term=descubre+1+leccion+3+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407813/normal_6019a14d7c218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369645/normal_6047056cc4c8b.pdfIn PDF document text
    • https://benadegerabo.weebly.com/uploads/1/3/0/8/130874398/zurotonaxazi_bowikedekimab.pdfIn PDF document text
    • https://zuxevuzefadum.weebly.com/uploads/1/3/0/7/130775429/zosapuna_detaxasajele_vusure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368768/normal_6063e68361c01.pdfIn PDF document text
    • https://puxokobipo.weebly.com/uploads/1/3/4/5/134524361/5ff636ccbd548c.pdfIn PDF document text
    • https://todusoxi.weebly.com/uploads/1/3/3/9/133999566/poputu.pdfIn PDF document text
    • https://mubafuzolifuben.weebly.com/uploads/1/3/4/6/134644730/kidusuditi_zidizusufos_luzezot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494877/normal_6058e36bb17ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451766/normal_5fceba86c2ed6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383451/normal_5ff7bf81821bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489056/normal_5fee4c8a4b4ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bovozajezo.pbworks.com/w/file/fetch/144475728/24964008642.pdfIn PDF document text
    • http://xixokuzujoz.pbworks.com/w/file/fetch/144427209/fuxifajejikog.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144413772/cheat_engine_ios_13_no_jailbreak_free.pdfIn PDF document text
    • http://fotikeralo.pbworks.com/f/46656923326.pdfIn PDF document text
    • http://jebusolole.pbworks.com/w/file/fetch/144597204/is_co_ionic_or_molecular.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0cfff1c-0515-4651-aa59-edfc43f87692/how_to_find_slope_with_two_point.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/707f298a-3a20-42b9-bb4f-ea49e87e6e93/nasofobexesanilatas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de458bdc-f426-40ba-8c31-b48cc17cc50e/winipobuwutirunamefowapib.pdfIn PDF document text
    • http://mijatonevu.pbworks.com/w/file/fetch/144598257/fusogexogifujisekudu.pdfIn PDF document text
    • http://xutosop.pbworks.com/w/file/fetch/144602658/32207030723.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_off0000d1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E5 5240 bytes
SHA-256: b31161cefca3757378cb53c2d6eb55eb77b11ca5f60bacb48b7ef7657e8af2a8
font_01_sfnt_off0000e3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E4 10700 bytes
SHA-256: b30f845bb62e6bd8b6098c47d4564a49d191bca49c1ffc20fafca2ff5ae5e869

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