Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac434ddb3771907b…

MALICIOUS

PDF

68.7 KB Created: 2021-03-17 14:20:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 52cae63acd37986f2781ff6f8dad0f0c SHA-1: b044d14ba3db0510dd32e887a51a7483c92fa52a SHA-256: ac434ddb3771907b60715829ae4c87aa85099d1177e758bade9e67b6b7639e0c
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to 'workbook answers', a common phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dugedepap.ru/wix?keyword=egan%2527s+workbook+answers+chapter+36 PDF link annotation
    • https://cdn.sqhk.co/golemejexeno/hihihjh/16335615155.pdfIn PDF document text
    • http://wiinorama.fun/skyrim_trade_routes_modf1mv1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384046/normal_6014424d260d1.pdfIn PDF document text
    • http://rowokalasi.iblogger.org/rutisixirakopu.pdfIn PDF document text
    • http://ideal-it.fun/cub_cadet_lt1046_deck_partsoii4o.pdfIn PDF document text
    • https://cdn.sqhk.co/raserijene/dFgflhd/slidey_block_puzzle_cats.pdfIn PDF document text
    • http://4d-5d.com/gezuverifakigi1u9vn.pdfIn PDF document text
    • http://gloslides.com/29437191242h3p1z.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/zivabizawufatopec81rp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492250/normal_5fca623940180.pdfIn PDF document text
    • http://santaparker.store/delevalamupimezotufspxmf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381340/normal_6028302ebbb46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411229/normal_60168c08916fb.pdfIn PDF document text
    • http://dipurenirexo.22web.org/66817967918.pdfIn PDF document text
    • https://cdn.sqhk.co/wivodojeg/hjetjjI/39675706047.pdfIn PDF document text
    • https://cdn.sqhk.co/wizokawoxo/bhcieig/grumpy_cat_running_meme.pdfIn PDF document text
    • http://raifaisentgo.online/ballade_pour_adeline_piano_notes9su2l.pdfIn PDF document text
    • http://dutivozupofamap.22web.org/libolikeri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_601546a0520ec.pdfIn PDF document text
    • http://litemado.iblogger.org/bubijuvoxipabovejepe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buximonerivib.epizy.com/inventory_valuation_report_odoo.pdfIn PDF document text
    • http://vovokab.rf.gd/antioxidant_activity_of_medicinal_plants_thesis.pdfIn PDF document text
    • http://nenilezum.epizy.com/62555118465.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_off0000ce37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE37 5768 bytes
SHA-256: 0234b9ab96fc177396b3f5662e5aaf7ea9b4f27889b3b5314a06189754e23d99
font_01_sfnt_off0000e1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F3 10464 bytes
SHA-256: 371f39f286ef54042d93937660486ac4a4b0c3c5d609dd2920b65226cdbf7f7c

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