Malicious PDF — malware analysis report

Static analysis result for SHA-256 24de1221f45e9fa0…

MALICIOUS

PDF

74.1 KB Created: 2021-04-16 02:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d2f3040fe93a535742ae670b0f03d1a9 SHA-1: 5f0295b252fe620a9dbdd06af8e299096e78fa27 SHA-256: 24de1221f45e9fa0427e772110a4e98d438202e5dffd2e979bc51da5e158c224
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. The primary malicious URL is https://botokaw.ru/strik?utm_term=what+is+the+sociometer+theory+of+self-esteem, which is likely used to redirect users to a phishing or malware site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=what+is+the+sociometer+theory+of+self-esteem PDF link annotation
    • http://patolul.iblogger.org/speed_and_agility_workout.pdfIn PDF document text
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/xaxonexit_pilinuweratap.pdfIn PDF document text
    • http://rekipeva.iblogger.org/2128248280.pdfIn PDF document text
    • https://zuwufapiju.weebly.com/uploads/1/3/5/3/135348861/saramoxozu-majapak.pdfIn PDF document text
    • http://ginumon.iblogger.org/telugu_chalo_dj_remix_songs.pdfIn PDF document text
    • https://kowagazobavov.weebly.com/uploads/1/3/0/8/130874359/suvegirom.pdfIn PDF document text
    • http://zumubexupon.22web.org/matawopugiluri.pdfIn PDF document text
    • http://itawomen.fun/5_relationships_of_confucianismlea3i.pdfIn PDF document text
    • https://xuduwenonotowud.weebly.com/uploads/1/3/1/3/131379268/9932876.pdfIn PDF document text
    • https://mejekuveko.weebly.com/uploads/1/3/5/3/135392268/4905356.pdfIn PDF document text
    • http://getbuiss.online/badger_5_numbers_for_january_1st_2021moxsk.pdfIn PDF document text
    • https://lekopejener.weebly.com/uploads/1/3/5/3/135323345/lujimipis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://menusos.rf.gd/what_are_some_safety_procedures_weightlifters_need_to_follow.pdfIn PDF document text
    • http://sidesapamapa.epizy.com/25236543650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf3ce672-ac94-4c72-b91f-67b8c795453e/nulanatasawuxutilofon.pdfIn PDF document text
    • http://judotopefov.rf.gd/xekuxinubaripa.pdfIn PDF document text
    • http://tumitodutib.rf.gd/50537072396.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04afb577-571d-40c3-a51b-11b114d3c0d1/4934448515.pdfIn PDF document text
    • http://kaguzawavor.epizy.com/new_york_city_street_art_map.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_off0000e49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49D 5268 bytes
SHA-256: 0b7f037407549c7f6363d227301a851ac4d149f8147f5dcdb60cac9f5f0ed681
font_01_sfnt_off0000f675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 10676 bytes
SHA-256: 1009096d714c2131eeba13c7d7acd044b1f59133f2bbdc8f91e598f11adeff6b

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