Malicious PDF — malware analysis report

Static analysis result for SHA-256 1deb48750bc15a20…

MALICIOUS

PDF

72.2 KB Created: 2021-02-06 14:41:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ef81f87a075d90efd6d810dd63c2643a SHA-1: e1afeee4cb2732374ddb473f6c9d752ae3e2d79a SHA-256: 1deb48750bc15a20864cc3b939cde775f8384a1931a0ff523591f4f9218d9b28
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to disposable hosting and known malicious redirectors, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure itself are indicative of malicious activity, likely leveraging PDF vulnerabilities or social engineering to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/wb?keyword=clostridium%20difficile%20guidelines%20cdc In PDF document text
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/f359e98fa0776a.pdfIn PDF document text
    • https://dolilufaxeni.weebly.com/uploads/1/3/2/6/132683246/zekipolupove.pdfIn PDF document text
    • http://xoxibusu.iblogger.org/2623433240.pdfIn PDF document text
    • http://banoduber.iblogger.org/hamlet_soliloquy_act_2_scene_2.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/hhig3ih/game_of_thrones_fanfiction_ice_queen.pdfIn PDF document text
    • https://cdn.sqhk.co/gifalaminika/GiciaIm/kupozisitunanebidopemabas.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/zadawijavumusa_zugoliw_jobafakabusebaj.pdfIn PDF document text
    • https://pesiwuveso.weebly.com/uploads/1/3/5/3/135392822/2271986.pdfIn PDF document text
    • http://sefajoga.iblogger.org/46240702361.pdfIn PDF document text
    • http://refowozawigut.22web.org/79524188883.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/rudumanura_renomexu.pdfIn PDF document text
    • http://buliwomof.22web.org/nizimiwobapibikipeji.pdfIn PDF document text
    • https://cdn.sqhk.co/lagolipumepi/ehfihgi/auto_photo_cut_paste_mod_apk_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gekavitominugi.epizy.com/granny_mod_apk_nullzerep_1._5.pdfIn PDF document text
    • http://fowasabitafal.epizy.com/76206427967.pdfIn PDF document text
    • http://rugiwixet.epizy.com/vuronufifeduru.pdfIn PDF document text
    • http://bemunaxeje.epizy.com/apex_hd_texture_stuck_ps4.pdfIn PDF document text
    • http://kifemulawej.epizy.com/jidixuji.pdfIn PDF document text
    • http://pusolegulijased.rf.gd/99564019318.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_off0000dd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD86 5036 bytes
SHA-256: eecd7b6a4761c82c225aed499e8701eae34fdf70aa3d4a47804ba81160dbda0b
font_01_sfnt_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 10788 bytes
SHA-256: a7c0aa5f2a3f356b74a5c99bced7ee30c1de8bf7fe3e72c7809d3f8b3b728b19

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