Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c0ef319eeb1303c…

MALICIOUS

PDF

75.2 KB Created: 2021-03-18 11:47:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4ddeb7727ad3fd57ba909593bd123e3b SHA-1: 5e737fdb698446ea74cc3ed5a56acb25d121aa62 SHA-256: 9c0ef319eeb1303cb1c97d05bd1fe1726241d5ed840e16dd73215dfb4a111919
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • 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://lozipotod.ru/strik?utm_term=lord+of+the+flies+chapter+1+quiz+questions PDF link annotation
    • http://warixedivukinat.mygamesonline.org/nanalekene.pdfIn PDF document text
    • http://modernstyle.pro/hand_embroidery_for_beginnersqralg.pdfIn PDF document text
    • http://nepoxiduvilej.scienceontheweb.net/viruvanonukenatezuna.pdfIn PDF document text
    • http://vogudikomi.getenjoyment.net/va_citrix_access_university_of_wisconsin.pdfIn PDF document text
    • http://pexulisinipev.sportsontheweb.net/balanced_diet_menu_for_a_week.pdfIn PDF document text
    • https://zoletewiv.weebly.com/uploads/1/3/2/6/132695336/8960288.pdfIn PDF document text
    • http://winclean-shop.space/farixaxavulear22.pdfIn PDF document text
    • http://lifeit.pro/9568650724essru.pdfIn PDF document text
    • https://wutuzorul.weebly.com/uploads/1/3/5/9/135963099/b4e1127390f9021.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/15481347697.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/c647e5c5-d211-47ee-b6a5-67eb52c83ab5/armitron_diamond_watch_review.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/phrases_to_start_a_formal_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/letter_to_explain_late_submission_of_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9200a451-adab-4d8a-862c-3cdfad83e769/20761121329.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/plan_de_estudio_de_la_biblia_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e29bc3b4-822e-442a-9cb6-9410642e5670/99321341439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cda86f9c-6e57-4c3b-90f0-81ba29f56b2e/the_pact_2002_streaming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14b7776d-46e9-4986-9d05-4408fb72f304/29755829835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17beed7f-dcfa-4123-b7e4-f5cc77fbad7e/gta_v_premium_online_edition_ps4_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/update_whatsapp_new_version_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2c3c5d1-2b1c-4462-8c6e-1d81e596f784/kenuzotifokub.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/3919812891.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD874 5292 bytes
SHA-256: a356a8e31bac04f2392f4d70db48411d4f1188b8f86f9fa6864a232cb3928313
font_01_sfnt_off0000ea7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7A 10908 bytes
SHA-256: 4f2a4e14f78afbafd687a7005ca1d1c94da34c59ab05d9f1015f5c3926ce0e7e
font_02_sfnt_off00010f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F80 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2