Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32bc04c09b890b7…

MALICIOUS

PDF

77.7 KB Created: 2021-04-02 17:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e36e07639c880337797b8f51a75b82d3 SHA-1: 82ea1d914dac65f651f020c32d105de582d79314 SHA-256: c32bc04c09b890b7fcdc4fc3d9232484563b3c9707550c17bcf05d09661983e6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains text related to a book title, suggesting a lure to disguise malicious intent. No scripts were extracted, but the presence of external URIs and the phishing heuristic strongly suggest malicious intent.

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://baarspo.ru/strik?utm_term=como+falar+bem+em+publico+livro PDF link annotation
    • http://it50save.info/afunika_latest_songs_2018f4lyh.pdfIn PDF document text
    • http://abanca-electronica.com/richard_iii_act_2_scene_4_summaryvpwrt.pdfIn PDF document text
    • http://alifan.store/fishing_age_fishing_game_to_reward_mod_apkhrqn5.pdfIn PDF document text
    • http://kamini33.ru/why_is_the_second_paragraph_of_the_declaration_of_independence_important1ui8z.pdfIn PDF document text
    • http://sk-anker.ru/ue_megaboom_3_vs_jbl_charge_4_bassv2ljx.pdfIn PDF document text
    • http://idealica-italiaufficiale.site/1787554455co83d.pdfIn PDF document text
    • https://tesurupijirixu.weebly.com/uploads/1/3/0/8/130813669/659317.pdfIn PDF document text
    • http://giftcard-sale.store/a-_123_appendix_a_implementation_guideeaout.pdfIn PDF document text
    • http://xenobezunareso.22web.org/sedubi.pdfIn PDF document text
    • https://zaxixeresez.weebly.com/uploads/1/3/1/8/131871416/4866516.pdfIn PDF document text
    • http://trastqort.online/82777981114kyebi.pdfIn PDF document text
    • http://zazonowipudu.66ghz.com/totaredogolowit.pdfIn PDF document text
    • https://gekafokolasiga.weebly.com/uploads/1/3/1/3/131384301/befafiwo.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.website/59290552801hfsf7.pdfIn PDF document text
    • http://figixigipikunu.iblogger.org/wedding_march_violin_sheet_music.pdfIn PDF document text
    • http://alisabor.design/pirates_of_the_caribbean_keyboard_notesazawe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_902a2926c3434a87a98e15415aa7f68c.pdf?index=trueIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_ef9c31fdbb1041049a345cabeaf4a738.pdf?index=trueIn PDF document text
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_85cd32f31cea496aac3dbbab7dbcbe40.pdf?index=trueIn PDF document text
    • http://xafupuzekiv.rf.gd/a_face_in_the_dark_full_story.pdfIn PDF document text
    • http://tisudaxutuz.epizy.com/tutorial_de_scratch_2._0_en_espaol.pdfIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_bc2c32b917ed4e71803dd65bb489fc9d.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_off0000ee73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 5088 bytes
SHA-256: 7f4a7da432e03e9c879c777e1eb1aa5bf0e8004a83d4241df022695d277c41ce
font_01_sfnt_off0000ffb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB1 13224 bytes
SHA-256: bf2ea7f065f2a19b44564800e41c827c88aa73c7963de5da3ec55e0dad7cfb80

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