Malicious PDF — malware analysis report

Static analysis result for SHA-256 4296c6cad697ee09…

MALICIOUS

PDF

70.9 KB Created: 2021-03-25 23:12:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 551353bb970c4827579885ea07c87e70 SHA-1: 22ab05310b1a7db98422d36d7442ed52aceaac11 SHA-256: 4296c6cad697ee097592a87eca4c0855b9fd7d490e75a1b2d176d3359216d882
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded URLs are likely used to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://botokaw.ru/award?keyword=subject+pronoun+and+possessive+adjective+exercises+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411714/normal_605c58d142167.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/fk6qji1/bozalud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501632/normal_5fe7ce2cc1dc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489740/normal_603b230620c73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369183/normal_5fc6746fbc4da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495391/normal_60068265c31f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373259/normal_5ffdd4aa8c549.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/jcQgfia/bird_lands_on_skydiver.pdfIn PDF document text
    • https://cdn.sqhk.co/pidikuso/fSF01jj/uncertainty_principle_sentence_examples.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384167/normal_5fd68bf9b944f.pdfIn PDF document text
    • http://jesofoma.getenjoyment.net/how_pathogenic_viruses_think.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371498/normal_5fee396740c42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420604/normal_602e7b59d4e0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443803/normal_5fe0835d83891.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387046/normal_5fe007f7c3224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495400/normal_600c39200e394.pdfIn PDF document text
    • http://gefokugok.getenjoyment.net/partition_aline_piano.pdfIn PDF document text
    • https://cdn.sqhk.co/molipigi/3jjiemv/monster_trucks_2016_movie_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393483/normal_600c97fe86019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450421/normal_5fda23a5d25c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://foxukekamusun.onlinewebshop.net/83829182841.pdfIn PDF document text
    • https://ea0a6730-5b47-42bc-899c-5b27b21b32ea.filesusr.com/ugd/184298_5864b92fda414274a689ebcb1aa065b6.pdf?index=trueIn PDF document text
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_1da719de409a425483c9df4dd1ee43c0.pdf?index=trueIn PDF document text
    • http://tevefetilojas.atwebpages.com/active_directory_interview_questions_and_answers_l3.pdfIn PDF document text
    • http://dokudaruriwiv.atwebpages.com/ryobi_bench_top_drill_press_parts.pdfIn PDF document text
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_732784377257485bbbadaedba67da23f.pdf?index=trueIn 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_off0000d6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E9 5564 bytes
SHA-256: ab8a0fff49395458935f56f163d4b46b786ac3c656824dbe73d7bab5aa4b4a95
font_01_sfnt_off0000e9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 10460 bytes
SHA-256: db847a6b4fbb7fd8ce4dd8db49f6cf73e8216184bdee15c897604ddc1a165ecc