Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7aa5f328447de22…

MALICIOUS

PDF

78.3 KB Created: 2021-05-15 04:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb401411db7622feeca77a15359ffa3e SHA-1: bf02af281635a6c1ce5327fb3c55ca6e3d4a469d SHA-256: a7aa5f328447de227e97f3a04c5acdd7f48e114ea9b1e3e4f174df3e2bbd8fb5
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 or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://ponafet.ru/strik?utm_term=club+car+wash+iowa+city+phone+number
    • https://mepogazab.weebly.com/uploads/1/3/4/5/134501519/c910b.pdf
    • http://perevod24-card2card.site/sms_messages_app_ipadoocyn.pdf
    • https://cdn.sqhk.co/daxegajok/cmwHfhc/lizaximut.pdf
    • http://winoorama.site/hard_rock_ringtones_mp3_downloadu89zb.pdf
    • https://motuzepiruwilo.weebly.com/uploads/1/3/4/3/134348631/1620813.pdf
    • https://nuropasidax.weebly.com/uploads/1/3/5/3/135393275/naxufejurotokonibek.pdf
    • https://cdn.sqhk.co/jodariwem/ZHcQigk/l_t_annual_report_fy_2018-_19.pdf
    • http://liketsven.xyz/how_to_enable_airprint_epsonuz1ru.pdf
    • http://vugalox.22web.org/free_digital_marketing_for_dummies.pdf
    • https://fomunova.weebly.com/uploads/1/3/4/6/134684458/sifekinivijo.pdf
    • https://cdn.sqhk.co/neseleko/gdejbGF/16222822456.pdf
    • https://gasagegote.weebly.com/uploads/1/3/4/3/134333211/9496203.pdf
    • https://cdn.sqhk.co/jorisuzil/hifkDjc/dosubetesapolujogesexepi.pdf
    • https://cdn.sqhk.co/gepabafi/xngfiCr/minecraft_world_edit_download_tutorial.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2e96d104-cacc-4af9-914c-411927af6089.filesusr.com/ugd/0f866b_6d9eedc4022d4369b0685bc92bf15bf6.pdf?index=true
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_694dfc79a27d4507ba08af53dc2eaa6d.pdf?index=true
    • http://tugujaxozulir.rf.gd/anno_1800_war_guide.pdf
    • http://finunaji.rf.gd/rem_live_bootlegs.pdf
    • http://wedizakur.epizy.com/sample_letter_of_intent_for_graduate_school.pdf
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_e77eec6fbbce4d519467cc90cf54cd95.pdf?index=true
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_92f9a09784eb4acd96fbb7a2f8dc6113.pdf?index=true
    • http://jabisuluro.epizy.com/citadel_group_annual_report.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e7.bin
f7d694db6249b999f7a456c82a0f0caf31f0b5e382430048310b6dd89ee277c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 5412 bytes
font_01_sfnt_off00010635.bin
e1e07ef734fd2917e72196a3d0dd4311f3168567b63fe3a9fcee304fa10a67a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10635 10948 bytes

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