Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcb4379c01915de…

MALICIOUS

PDF

120.6 KB Created: 2021-05-29 03:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0797d928f2a3a7d5c0d9d1b48663ad1a SHA-1: 042917e1eb6aeb58e56022349fc1aa8f538271dd SHA-256: 5bcb4379c01915decc530012aba1e231e4458816a2cc97f773c9a993579b7d69
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 0.9993

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://gimoguvi.ru/123?utm_term=catalogo+de+aceromex+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390995/normal_600ec26711bb6.pdfIn PDF document text
    • https://dojifidixiwaji.weebly.com/uploads/1/3/4/3/134372722/1b623cdb90.pdfIn PDF document text
    • https://kegovivaxik.weebly.com/uploads/1/3/4/5/134506491/9220925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488804/normal_602148cbc7a83.pdfIn PDF document text
    • https://nerefowat.weebly.com/uploads/1/3/4/8/134856831/lajubekapo.pdfIn PDF document text
    • https://lorafapewokaxan.weebly.com/uploads/1/3/5/3/135342596/jekirate-kuxivulibi.pdfIn PDF document text
    • https://gajebafanagifim.weebly.com/uploads/1/3/2/8/132815836/9f58ae991c39.pdfIn PDF document text
    • https://nabinavupofi.weebly.com/uploads/1/3/5/3/135350319/sekut_migiv.pdfIn PDF document text
    • https://sejelenowoloza.weebly.com/uploads/1/3/4/5/134518320/7327266.pdfIn PDF document text
    • https://vasigigu.weebly.com/uploads/1/3/4/6/134607878/7714043.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/0cad3268-4bcf-4554-8436-311128d80658/how_to_interpret_law_of_diminishing_returns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b72ab37-4efa-41bd-9b10-384cbc4c7be5/caracteristicas_de_enlaces_covalentes_e_ionicos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d57b4d3-c3f2-4ae9-8c4e-8ff579743fb5/georges_marvellous_medicine_art_activities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e2941e5-ab23-495a-a68c-b0447c9b10b2/troy_bilt_pressure_washer_manual_2700_psi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afaf3057-ff26-49ff-86ba-c930dff74a3d/cant_connect_2_jbl_speakers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88d1b314-9fd2-46d0-9c69-c2c9087db0cd/54135878673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1defa3c-2933-46a8-a27b-53188867e989/how_much_does_a_new_pair_of_glasses_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72ce6610-4a32-4e19-b785-112ae1a9a067/xijeno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/767fc75d-f982-493d-a321-c54bafb7bd0d/whirlpool_washing_machine_filter_clogged.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e59fb212-7747-4437-b058-77a05bf66407/ap_biology_exam_2016_free_response_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17c34bdb-effd-4f9d-b9a0-1f3cad009b03/81635508875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80d59841-2b96-4775-bf55-afa5a8bb41cc/931814423.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ddf6660-c7cf-4672-84d8-c6bee2fe4deb/essential_oils_handbook_for_beekeepers.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_off000194e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194E1 5268 bytes
SHA-256: 3f64b03a75c925f6875a2974695ae8f18b6c577e6c1491081b8f1fa8e64eae75
font_01_sfnt_off0001a6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6BE 13792 bytes
SHA-256: 433bc2c30459b3ecb25c49febd446809a56d364fbda257d7d4dd877dea3294c2