Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a81b5ba4488664…

MALICIOUS

PDF

82.0 KB Created: 2021-03-10 01:02:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 785ecca5f3df14b9aa24b0e2b02d773d SHA-1: 225b24428e78b11152e4caa79674042ea395a8ea SHA-256: 21a81b5ba4488664479a1ff4a22d734d199b71c5a71d03b80ff42ace8f86b2b3
186 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, many of which point to disposable domains or are used in a link farm configuration. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing or trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://kuzutuzo.ru/123?utm_term=shiny+apple+cider+nutritional+information PDF link annotation
    • http://fasad-dom.site/42676864671icwvk.pdfIn PDF document text
    • https://velonifiwivuli.weebly.com/uploads/1/3/0/7/130739758/2691097.pdfIn PDF document text
    • https://suzeziji.weebly.com/uploads/1/3/0/7/130739492/xodekopokel.pdfIn PDF document text
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/5166095.pdfIn PDF document text
    • http://instasale.company/zunofis9vqxf.pdfIn PDF document text
    • http://trend-sales.fun/s_s_gathal_history_bookgfb3f.pdfIn PDF document text
    • http://getchambre.xyz/how_to_cite_an_organization_website_with_no_author_mlagd4iv.pdfIn PDF document text
    • https://voxomusixexuso.weebly.com/uploads/1/3/4/8/134851372/ba0ad.pdfIn PDF document text
    • http://lassituda.online/61361282ke5eg.pdfIn PDF document text
    • https://jifurutirijiguj.weebly.com/uploads/1/3/4/5/134528482/5105657.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/8d9a0f86-281e-451b-aa80-db5477b51d16/the_shack_movie_where_to_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c28bcb5b-f0b0-4964-aa07-1444708c8bd3/economic_loss_rule_california_special_relationship_exception.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/97985356743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e8d677-7cc8-407b-8959-56d9026c885c/is_dad_capitalized.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb15b2d8-53f1-4daf-b922-0412b7c61e15/13734797665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c996cc9b-6524-47c1-b729-54ac09c364fa/best_way_to_learn_midi_keyboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d51b47e3-3f19-41af-b38c-6c9dabc80ca0/skyrim_how_to_install_mods_on_cracked_version.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/ferobanefexekisezenol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f3a505-f590-40e7-a753-76960315ab2f/my_dyson_airmuscle_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/623e1b6c-3f3d-4862-a00b-e6330324f6ef/69692134435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/339b1c49-c07c-43b0-b154-3ab249177dde/kutekomufariwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b69cc2cf-3a21-4171-a869-8a396cbeeac3/jutemaxanimorabivobelurun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0acae40d-4146-4ab5-addf-75ebe0467474/5_competencias_para_la_vida_ejemplos.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/87058746790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/691b264b-46cf-4c93-96bd-8ac7cba2e797/sevulejolarogivogot.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/45232029059.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_off00010143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 5424 bytes
SHA-256: 779c55824fac2a7b4773cade8cfca9154c70f898889bcbcc87a73880791443ee
font_01_sfnt_off00011396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11396 11356 bytes
SHA-256: 2a4ef4249c7401217b4f1da697216100febb3a5d27932845e043f6065c0f6ab1

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