Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a759dd6dc901d8…

MALICIOUS

PDF

79.9 KB Created: 2021-03-13 14:33:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5635d4f1dd383505108ed28cceba1151 SHA-1: 1579ecab3abbb2434bbb900d02c240c6ccc09c75 SHA-256: e6a759dd6dc901d86a5b0740c644b41bc1c5ef5dfb6eb3301f568c3d84d8839a
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 0.9997

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://dafemum.ru/wix?keyword=aerocapsulas+ventura+simons PDF link annotation
    • http://osummer.space/9069449713641ynh.pdfIn PDF document text
    • http://timelessdecorum.com/best_chess_openings_for_white8mjt8.pdfIn PDF document text
    • https://simisodiguguvig.weebly.com/uploads/1/3/5/3/135324772/7940258.pdfIn PDF document text
    • https://gofetudorupu.weebly.com/uploads/1/3/1/4/131408581/pedufufesikivoni.pdfIn PDF document text
    • https://noregodexu.weebly.com/uploads/1/3/1/8/131871467/nukulolo.pdfIn PDF document text
    • http://jakesubinosol.scienceontheweb.net/anatomy_of_an_earthquake.pdfIn PDF document text
    • https://daniwevuwawudo.weebly.com/uploads/1/3/4/8/134849628/naxepinupofem.pdfIn PDF document text
    • http://pasetbs.xyz/sufilixupolev8ag0n.pdfIn PDF document text
    • http://pirewarekow.mywebcommunity.org/lasawijosezidenuz.pdfIn PDF document text
    • https://mutazodot.weebly.com/uploads/1/3/0/8/130874237/filewosa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_ae6cce66634041fb929ace3bafcd5295.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/responsive_website_templates_free_themeforest.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/polaroid_is_048.pdfIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_7ca769852f7f46c2b48bf1f5a4304224.pdf?index=trueIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_7ba9f8959007448694676e5c26a17628.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f501880c-57fc-4ac7-9a68-f739e5b911f9/epson_3020_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd3da4a4-080c-4988-994b-a743b23b56a2/sojuti.pdfIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_35424646ad36449da6bb23b28f18ffa2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wifukedot/cisco_e1200_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/metal_gear_solid_2_sons_of_liberty_vita_controls.pdfIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_a1f6da06a5214830a632c64a59250bf1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c16819b2-1035-4bfd-a2c0-b6ad65241063/jejufefuda.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_off0000f896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 5128 bytes
SHA-256: 07b681bf89196deec630508a4349d3268c9193f7b7b7eb7aabd27bc34bf28009
font_01_sfnt_off000109fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 12020 bytes
SHA-256: 1e0dcfcff262dc4716877a03f89e9ed8d2d8f038967fda9ca3c01bbd13768127