Malicious PDF — malware analysis report

Static analysis result for SHA-256 caac8e6c79dc37f3…

MALICIOUS

PDF

79.9 KB Created: 2021-04-25 08:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 074b8e1c5598d5f173016bb432bd1792 SHA-1: 42fe34df1c637fa86364b5ad068c6f3e24f67cc5 SHA-256: caac8e6c79dc37f30954cd688df438b607dc89b49e89b8e56831b87b6e3d6f33
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous embedded URLs, with a primary malicious URL pointing to 'xezojetit.ru', suggesting a phishing or malware distribution attempt. The authoring application 'wkhtmltopdf' is noted, but the primary threat stems from the external URL and the detection signatures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=how+do+i+know+if+he+is+ignoring+me PDF link annotation
    • https://cdn.sqhk.co/gitaligido/jcDgehh/wedding_march_sheet_music_for_beginners.pdfIn PDF document text
    • http://fakaripeti.xyz/radio_italia_anni_60_playlistcbuaw.pdfIn PDF document text
    • https://cdn.sqhk.co/novitovikor/ugeghif/uae_exchange_rate_today.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449602/normal_6057a4504a7ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460968/normal_5fc6bb4023c4f.pdfIn PDF document text
    • http://sis-paypal.com/curso_de_programao_online_gratuitos_com_certificadonv8p8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486200/normal_5ff4216c9bfdc.pdfIn PDF document text
    • https://cdn.sqhk.co/pugijuzo/Q44XVjb/13156235907.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvazuginu/him1hj5/music_player_for_pc_free_download_2018.pdfIn PDF document text
    • http://richmaya.site/xusukatexem1z1g.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxesojogugu/udidggL/14657124309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426543/normal_6064ea5801ebd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412588/normal_6058a05fb53b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_603470eda20cd.pdfIn PDF document text
    • http://useporte.xyz/merge_multiple_excel_worksheets_into_onekikw1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/566a770c-f03e-4457-a397-71920041467d/dish_network_pay_bill_telephone_number.pdfIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_ce289772827a41c39f18d9f70eae1ca8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd48318e-6ab1-42ef-aa63-eebbf73b0618/technical_writing_degree_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdc306ac-243d-48a2-83d5-8b55a099366f/can_druid_dual_wield.pdfIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_74fa60a729fa4224a70717f460f9450f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b737b276-6f55-47fc-ab32-6c293863b9a7/50511766443.pdfIn PDF document text
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_12f9acc67473499881cb1c6f4ba9b748.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5d10192-69b3-40cf-aa13-7adc9b075976/math_facts_practice_worksheets_5th_grade.pdfIn PDF document text
    • https://def05634-b969-4265-beeb-1e7d695e9a44.filesusr.com/ugd/6865ce_d03ca94b5a5a4c2ca75f2615b4bab3fe.pdf?index=trueIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_770da17af05f4d2fbb647607c5b0dbfe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 4904 bytes
SHA-256: 09857e9f2c6ce4f43fe49170c8415e0a6660e9ee1683a68252adce91a698f564
font_01_sfnt_off0000ff90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF90 11024 bytes
SHA-256: d61e1a7be9fa4a464c56b362b2bcff674f8336bd5b322d560fd11429c3f436c6
font_02_sfnt_off00012476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12476 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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