Malicious PDF — malware analysis report

Static analysis result for SHA-256 06651b8f1fb8e141…

MALICIOUS

PDF

70.1 KB Created: 2021-03-30 11:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d88bbff88a452db4929ace41e0077d7f SHA-1: e8db3daa915ed17d80ce46b057aebf47d64da8d5 SHA-256: 06651b8f1fb8e141f7397624ac6693eb073a72c5c64e1720977999a3ee60a4af
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a tactic of directing users to external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://mezovuduw.ru/strik?utm_term=what+is+the+best+weight+loss+food+plan PDF link annotation
    • http://olymp-trade.top/7698494696922tw1.pdfIn PDF document text
    • http://lojasamericanasbr.com/obra_romeo_y_julieta_resumen_cortoe0jxa.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/digital_signal_processing_salivahanan_free_downloadnt2gx.pdfIn PDF document text
    • https://cdn.sqhk.co/jebumujo/Xhgf0gh/battleship_cove_hours.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/ivms_4500_iphone_configurationzasbx.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/HihFiic/disimoxukiledalasufabiva.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/aIhPmaw/ballet_folklorico_classes_for_adults_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/munoforifuso/hiic7gi/jirefotosuwizabizaxenuwo.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/hejbih7/abalone_shell_meaning.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1875e084-cea6-4ac0-ba20-6c18fd6fc328/76664550092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c03771a0-c3bb-4862-b9fa-f3d39a0d938b/how_do_you_cook_a_brisket_on_the_big_green_egg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa205c33-1793-41fb-8e79-80c067eeb629/71517996734.pdfIn PDF document text
    • https://82656f1f-dd0f-4426-89ca-c5688288f975.filesusr.com/ugd/56de54_20fff58bb37547e39dcf3fbcbee3916f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd6376bc-4b53-4cef-9193-78e4db9d8a09/estructura_externa_e_interna_de_un_texto_literario.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e0fd111-0d64-4194-86ee-5c7dc8473e00/97825359632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/249534b5-b839-47bf-a283-1cf0fd14c27e/gopoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f4a1444-2d41-4472-a048-bd7a713e3b49/kenwood_ts-440s_dot_problem.pdfIn PDF document text
    • https://9f61dd91-ea7e-4edc-a837-c43fae5dccfb.filesusr.com/ugd/ed897c_6a29c54cde294e468320cb720fbec820.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f91a0b8-60c3-4a3d-8a6e-e34981e2012a/beats_solo_hd_price.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_off0000d2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C3 5452 bytes
SHA-256: 7f9f2052894b6b89a25486daedef74ff88012740865e228dcfc5140300c1bb34
font_01_sfnt_off0000e567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE567 10516 bytes
SHA-256: 4c08747e97359a2a2905490684c2fbddee529a9253e4754d36fe0a98e56a846b