Malicious PDF — malware analysis report

Static analysis result for SHA-256 adae93c472c8046d…

MALICIOUS

PDF

87.3 KB Created: 2021-03-12 14:41:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 057a668cd9d83a9e0559036fbf9be085 SHA-1: e16a7ff5626906f5b08afd0e68e9ebac1c337965 SHA-256: adae93c472c8046de33bd920d472c7f2b38653a3c96bea6b0f32e6b12e8f2795
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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/123?utm_term=ias+mathematics+optional+syllabus+pdf PDF link annotation
    • https://govotewimodiku.weebly.com/uploads/1/3/4/6/134649218/1114753.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/88926116616.pdfIn PDF document text
    • https://ludebopukum.weebly.com/uploads/1/3/1/3/131380916/7845147.pdfIn PDF document text
    • http://sibatike.getenjoyment.net/dc_training_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/palazawu/AJjiEjf/super_mario_run_world_6-_1_purple_coins.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/eAiaWgg/mcat_score_percentiles_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470385/normal_601ddaab50d62.pdfIn PDF document text
    • https://bujasosepamus.weebly.com/uploads/1/3/4/6/134626994/dc9d91b2a6f371.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422906/normal_602f412c5a806.pdfIn PDF document text
    • https://viwalamul.weebly.com/uploads/1/3/3/9/133997630/7288023.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490366/normal_5fdfb6e429214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460970/normal_600c052634939.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/03918d44-9b09-4dff-ad15-aed149a61179/how_to_work_afterglow_xbox_one_controller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44609297-e1ca-4391-aeeb-0dfc6fd9a718/how_to_draw_a_nose_step_by_step_for_beginners_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c24023ad-d1de-4598-8f5a-89154f4132fe/35885923184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad5be1e4-8867-4a47-8f96-777ad3279bee/how_to_make_paper_crane_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14f79fd9-8ebb-45f4-8f8d-fac0a10a7e0f/59214747944.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_off0001199a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199A 5476 bytes
SHA-256: b8bc77075c2877ad92d82274cfb8afec71a2111a7fcecfd9316ff4d34b2548fe
font_01_sfnt_off00012c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C20 10616 bytes
SHA-256: 4da714d145fa3ae479a55ec17ef5699ae4b4115cf757646dbdef2bae0844e5b4

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