Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b4dbd89c6712f4…

MALICIOUS

PDF

71.8 KB Created: 2021-03-05 08:06:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3258721481be3621ac4de601e2e1e1d4 SHA-1: 8d94fc1759b35849ad52962643195165eb688c72 SHA-256: a4b4dbd89c6712f404f44bb5fc1eafdfe99a75757618445551255b49b792e33a
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The document body, though heavily obfuscated, appears to contain keywords related to academic resources, likely a lure to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://ponafet.ru/123?utm_term=computer+networking+a+top-down+approach+6th+edition+solutions PDF link annotation
    • http://nat-fru.space/41247901826ofn42.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/pPgiXyc/nicole_sky_squad_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/gcjaAdX/volejisedinewipo.pdfIn PDF document text
    • http://aycotoro7.xyz/my_cloud_home_duo_4tb_reviewk3s3r.pdfIn PDF document text
    • http://espaceabone.com/defensa_nacional4k0n9.pdfIn PDF document text
    • http://giocodigital.fun/bible_study_fellowship_lesson_4_answersbq06j.pdfIn PDF document text
    • https://cdn.sqhk.co/mazinatefoso/iemDjAR/20774108195.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/BCjf7t2/gobukesusewoluxakatapix.pdfIn PDF document text
    • https://cdn.sqhk.co/murerezusa/VWKibEB/clicker_heroes_best_ancients_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwoxegolewa/Glo4vih/mediaf_re_descargar_undertale.pdfIn PDF document text
    • http://retys.space/pulumatogibadarokuvudud2av8b.pdfIn PDF document text
    • http://naykaryadom.fun/how_to_put_filter_into_brita95yjb.pdfIn PDF document text
    • https://cdn.sqhk.co/moturira/jgjggCI/obstacles_syd_matters_life_is_strange.pdfIn PDF document text
    • http://nncucuucuc.space/160844152408ep98.pdfIn PDF document text
    • http://relax35.ru/material_safety_data_sheet_format3oicj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_a69dda2896d44595aa7d3b80c85b5a74.pdf?index=trueIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_697feafa42b3422c85ae03640bb43ba3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gozilum/asos_shoe_size_guide_cm.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/python_sklearn_decision_tree_tutorial.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_bfccc17060d041b5b6bab3d2dcf1ab18.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/armored_core_for_answer_pc.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_off0000d9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D5 5732 bytes
SHA-256: 7c1d592ea16b41b93ac9d530562beeab83bc5490b98ca51a18e384c63f173552
font_01_sfnt_off0000ed46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 10488 bytes
SHA-256: 5f5dc5a49480818b4759fbfe7240fcb1b84bb80851846b09bd27cc09e828e1c4

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