Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b13afb5acbcbb6…

MALICIOUS

PDF

72.4 KB Created: 2021-05-11 19:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 96bd09ec483e2856979a3ac19251028b SHA-1: a34520d86cbfe1defd6882c95875ed1c1d087e4e SHA-256: 33b13afb5acbcbb665e3c7bcf650f2c5b8766b5f3dffbc373a0eff9ed0892259
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://jottigo.ru/strik?utm_term=hayward+t-15+salt+cell+warranty PDF link annotation
    • http://sizerasadaxer.mywebcommunity.org/90361414228.pdfIn PDF document text
    • https://cdn.sqhk.co/rumoligodo/7hbhjpd/gorevo.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/glkiijh/37947139217.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/bjilQgh/11510212255.pdfIn PDF document text
    • https://cdn.sqhk.co/rosojolude/igjjtij/79545199403.pdfIn PDF document text
    • http://kupimaxi.sportsontheweb.net/rewepenebukopejag.pdfIn PDF document text
    • http://kositexujir.sportsontheweb.net/12468673286.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/fd33b43a-4b61-4f7f-8891-e694285dc6cd/67008488687.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/basic_biomechanics_susan_hall_8th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/why_are_ge_cafe_appliances_so_expensive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50079394-d7b5-445c-ac5b-af680ad8f4f1/68752262859.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/wonder_book_report_poster.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/ppsspp_emulator_free_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/30643560509.pdfIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_2da89b8315fa44c2a3156ced61cf25b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9090b7f1-37f2-41c9-8a59-10318f9e6874/mejores_restaurantes_para_el_14_de_febrero.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/what_is_a_conflict_of_interest_in_business.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/list_of_basic_guitar_chords.pdfIn PDF document text
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_0b90480168b045cc8a2e24c8f3529e2c.pdf?index=trueIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_52baa936f2ea49d6b9ae76b73446176e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nojemi/5372029482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f533663-3d40-46be-91d3-c6167bbc1dcf/oster_18_quart_roaster_oven_cooking_times.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/16802216563.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/armaan_malik_images_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e2fb223-bc48-4bf5-bd6e-af45c4f51349/how_to_repair_a_burner_on_a_glass_top_stove.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_off0000dcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 5296 bytes
SHA-256: a366f7a6c07bc62eff6cffbcbfbe34b1ad47121f93c7809aa159fe9017cd3977
font_01_sfnt_off0000eee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 10904 bytes
SHA-256: dd3fd44974f67b44ec8989559b2d5bf15576eb4996189bb04d7ba29b88a8e922

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