Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd651d32eed374ed…

MALICIOUS

PDF

77.4 KB Created: 2021-05-13 09:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ffd1dd5c4a7efb60584f6a238eb36820 SHA-1: a21c58cacacfa9718972a0859980798832ba7c9d SHA-256: cd651d32eed374ed50ad3a65e1640dda393e7d2ba69c94328314abbf31129ac7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=what+can+an+international+lawyer+do PDF link annotation
    • http://idealicaitalia-official.site/what_should_i_write_in_my_personal_statement_for_medical_schoolzzwu9.pdfIn PDF document text
    • http://kostlike.site/police_request_cctv_footage_form5ea67.pdfIn PDF document text
    • http://fherixq.com/144961735957tg9v.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/figufuwom.pdfIn PDF document text
    • http://sejujanovemo.medianewsonline.com/lurujagibugogixunifewugoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375531/normal_5ff4d9352d659.pdfIn PDF document text
    • http://magarunu.iblogger.org/dieta_baja_en_purinas_definicion.pdfIn PDF document text
    • http://sollabs.xyz/how_old_to_work_at_walgreens_in_californiagtjte.pdfIn PDF document text
    • http://stepka2016.xyz/saburebabaxuzukexe74140.pdfIn PDF document text
    • http://rocketdocs.us/5e_versatile_trickstertdz1w.pdfIn PDF document text
    • http://netewe8.xyz/adding_and_subtracting_fractions_worksheets_with_answersy1va5.pdfIn PDF document text
    • http://mazipuvaxa.mywebcommunity.org/kijakevimebomurikix.pdfIn PDF document text
    • http://filfex.ru/honey_badger_5euevlf.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404757/normal_5ff76aaf91e70.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_897b7ed42bd742668c5c5e18ea2e3795.pdf?index=trueIn PDF document text
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_6da6bae91d1948a7b59012bfada3421b.pdf?index=trueIn PDF document text
    • http://bobixupeto.myartsonline.com/26497878159.pdfIn PDF document text
    • http://kibulirol.rf.gd/astro_boy_game_pc.pdfIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_1862889f657a4427af0f73469c560af9.pdf?index=trueIn PDF document text
    • http://pimizebogo.rf.gd/critical_ops_apk_mod_obb.pdfIn PDF document text
    • http://sujawokasafu.onlinewebshop.net/illustrator_smaller_size.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_off0000eecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 5056 bytes
SHA-256: 482a691e5185367f9d51152129555cbb39a6061dfe867efac71e5ff1b728f039
font_01_sfnt_off00010011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10011 11332 bytes
SHA-256: 05c1f18bc29bb5b4c53e56531628d3d68fa89539f95741219933db0c1cb50c39

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