Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8c7057aba9af87…

MALICIOUS

PDF

67.3 KB Created: 2021-03-31 07:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e7d9f81794db48671660b6c851015b52 SHA-1: 235d588b0cef56b8a1dc9966e636c584852a8859 SHA-256: 7b8c7057aba9af87322232b945238051539c6cbd083226cdb16a9cb4a5084d65
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic specifically flags it as a link farm designed for phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the PDF structure suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

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=landforms+worksheet+grade+5 PDF link annotation
    • http://dobataxip.iblogger.org/mimizakosesebawepadaj.pdfIn PDF document text
    • http://baranaydin.org/xifugafomoremopjx8sr.pdfIn PDF document text
    • http://easy-money-cash.space/balancing_equations_activity_answersdkqfa.pdfIn PDF document text
    • http://help-copyrighteamservice.com/jineworajunimiseminefevev1v.pdfIn PDF document text
    • http://pipvip.ru/zemawalozaronigr47d.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/neketotepazetebugopuma.pdfIn PDF document text
    • http://fineagencyy.com/bissell_proheat_2x_revolution_pet_pro_not_picking_up_waters496e.pdfIn PDF document text
    • http://lunesygets.xyz/polar_bear_population_increasing_201845u1e.pdfIn PDF document text
    • http://agent-ritual495.online/words_to_describe_moonlight_sonatabz4jk.pdfIn PDF document text
    • http://tactical-jacket-sale.shop/254266763699ufz1.pdfIn PDF document text
    • http://savadaqwe.space/gerbera_cultivation_guidegs0h7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kixulal.rf.gd/34616678403.pdfIn PDF document text
    • http://nolonogatifotop.epizy.com/anomalie_informatik_definition.pdfIn PDF document text
    • http://satogitexuvo.myartsonline.com/advanced_english_grammar_for_hsc.pdfIn PDF document text
    • http://jamowekovexure.epizy.com/fundamentals_of_physics_halliday_resnick_and_walker_10th_edition_wiley.pdfIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_2a84920fc9a847e184e951ed0fba39fe.pdf?index=trueIn PDF document text
    • http://xaninulutinofeg.rf.gd/amazing_spider_man_2_apk_file.pdfIn PDF document text
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_2d51a62a7e9c4692964d661c2bffd123.pdf?index=trueIn PDF document text
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_0f619a9685074eeb8b12b8ff42a0134f.pdf?index=trueIn 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_off0000cac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC9 5508 bytes
SHA-256: 65c0d613852491a2c44e5aa2ce8e8b64f424e988f420d4199110890f9634feab
font_01_sfnt_off0000dd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7E 10160 bytes
SHA-256: 876af43838fe53f6055e97487334133cba5ce51ef343c5193b7cca239f598c75

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