Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe09a20460ec570…

MALICIOUS

PDF

79.3 KB Created: 2021-02-17 04:34:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5e6c8761323ad1c210a8716f876642c2 SHA-1: e48b8669f1b27e5d984a97c813383ad9c890f26a SHA-256: 4fe09a20460ec570abf3a9d3b6435b226e3e1d5446c87cb3f9a125b1566406e0
214 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links to external websites, many of which are likely part of a link farm or redirect to malicious content. The document body, though heavily obfuscated, suggests a lure related to educational materials. The presence of PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics, along with ClamAV detection, strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=prepositions+exercises+for+class+9+icse+with+answers+pdf In PDF document text
    • https://cdn.sqhk.co/tajixixejafi/cLheFMr/download_zombie_hunter_king_mod_apk_revdl.pdfIn PDF document text
    • https://wotapidedodibi.weebly.com/uploads/1/3/4/4/134475573/vafelekizubepe.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/Ihfjbhh/tank._io_online_unblocked.pdfIn PDF document text
    • https://tajamexuzoxobug.weebly.com/uploads/1/3/1/4/131410736/00428d.pdfIn PDF document text
    • http://salonapp.xyz/koketfrwmp.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/hoghgAB/find_new_snapchat_friends_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/mabisurud/2hbgfdH/xalifidazumukupa.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/yuSjbMa/leros.pdfIn PDF document text
    • http://ledimpress.biz/cant_change_channels_with_samsung_remotejbpxa.pdfIn PDF document text
    • https://fogufufizanalu.weebly.com/uploads/1/3/0/8/130813948/kewaserenaso_zalemapadek_xedaki.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/QWgf2id/caracteristicas_de_la_novela_picaresca_del_renacimiento.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://titegerekarirov.rf.gd/clue_calendario_menstrual_apk.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_off0000f7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 5560 bytes
SHA-256: c55df4217474d66e01d85fcfda2fb895a7fae5df188d6ffbb24f46c1ccb13836
font_01_sfnt_off00010ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB6 10500 bytes
SHA-256: 619022e57ff1392566f27d122fe1be8ea7b697048069943427acc29ddca69668

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