Malicious PDF — malware analysis report

Static analysis result for SHA-256 268b70adf07c37bf…

MALICIOUS

PDF

78.4 KB Created: 2021-02-24 05:55:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e443829ff67f2bbadc1f5a18f137c294 SHA-1: 33944695a014fb4b6446e26c360601782fbe433f SHA-256: 268b70adf07c37bf1301526f68be6bf329dcd447a51065d353e91b431d2553c5
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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 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/123?utm_term=how+to+connect+echo+dot+2nd+gen+to+wifi In PDF document text
    • http://sqrab.top/palajokerofokoxipamuwopusk02r5.pdfIn PDF document text
    • http://iuts.space/acustica_fisicaddejj.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/ifijBQE/infection_rate_of_covid_19_usa.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/nanazesupawudekirav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376849/normal_5fd8126b37575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415073/normal_5fd2646025ab1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375716/normal_5fc622e532200.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467274/normal_5fe0028dc6179.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/fWjijhq/23051267456.pdfIn PDF document text
    • http://pokanupat.iblogger.org/tikozorekutivas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403959/normal_6014c9abc0103.pdfIn PDF document text
    • https://cdn.sqhk.co/tedigedubemi/hejbij6/toolbox_for_minecraft_pe_premium_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/fgfIPjf/spendee_app_alternatives.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459791/normal_600556b023ad1.pdfIn PDF document text
    • http://lajulufubugo.22web.org/arnold_ehret_chomikuj.pdfIn PDF document text
    • http://dkblogin-de.com/lafulumasobelovfjaka.pdfIn PDF document text
    • http://redpandarecycling.com/california_dmv_study_guideph1wp.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/tjcjgih/29742653372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374368/normal_60180f283e68e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482413/normal_600a247698235.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rokosarod.rf.gd/chrome_browser_app_free.pdfIn PDF document text
    • http://bomofafavadu.rf.gd/sole_e25_elliptical_assembly_video.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 4740 bytes
SHA-256: 57da4deb6e7894c514fa1ef8bf51527a4b49d88bf43c99ab7566253297a7f678
font_01_sfnt_off0000f8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 10724 bytes
SHA-256: 5e25c67be6ef5dea57ba012ac3259a8a404bed48b818d12df0f84f6134088c9c
font_02_sfnt_off00011dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3