Malicious PDF — malware analysis report

Static analysis result for SHA-256 445f41db8aed4512…

MALICIOUS

PDF

74.5 KB Created: 2021-03-15 17:11:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7882cf8c3acc255e0a7f5bea98d847e9 SHA-1: 57bbd63683b6ecfc7822d0e4512c482c3fb92fd9 SHA-256: 445f41db8aed4512dd1b79efe08118782d9af2c5559f3e55b02d781b5c61ed24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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/strik?utm_term=how+to+professionally+sharpen+a+chainsaw+chain PDF link annotation
    • https://nobixerevogug.weebly.com/uploads/1/3/4/4/134481004/mitekovas-wudawukeda-vubulejuj-nunuxumibaxam.pdfIn PDF document text
    • http://luxusirozutifud.22web.org/assertividade_na_adolescencia_livro.pdfIn PDF document text
    • http://figironeme.22web.org/tiwokidus.pdfIn PDF document text
    • https://cdn.sqhk.co/gixejefi/XjdKvcc/make_up_meeting_in_spanish.pdfIn PDF document text
    • https://bopunesarikimar.weebly.com/uploads/1/3/1/4/131453984/demopegudunajim.pdfIn PDF document text
    • https://cdn.sqhk.co/tufiroxova/iYThcfR/pubg_sound_effects_download_mp3.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/9069125.pdfIn PDF document text
    • http://ufenmac.com/graphing_inequalities_on_a_number_line_practice_worksheeteadrp.pdfIn PDF document text
    • https://cdn.sqhk.co/fifotadog/taVgiic/wutixofukesator.pdfIn PDF document text
    • http://bitcoins-profits.com/miller_bobcat_225g_welder_for_salevhq6f.pdfIn PDF document text
    • https://dodapoxole.weebly.com/uploads/1/3/1/3/131398067/tizubizemuwur.pdfIn PDF document text
    • https://muluxebaxomoj.weebly.com/uploads/1/3/5/4/135401331/wegulafore.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bamemuwibe.epizy.com/ben_hur_telugu_dubbed_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c23f758-f964-4658-893b-42ba3859e729/whirlpool_gold_series_oven_cleaning_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce0a15a4-61b4-4d6d-bc7e-3406afce2908/what_to_eat_with_white_rioja.pdfIn PDF document text
    • http://gevowurarabaj.rf.gd/vederobisulufova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f24b0a7-271e-4413-a521-5175cbc42a38/befugadedel.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_off0000e1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C9 5260 bytes
SHA-256: 2fa33e5f668e03f3cab117709f13ab427ad72ef7badf7e55929cbe07a7d080a6
font_01_sfnt_off0000f3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 11380 bytes
SHA-256: 3d531fec909f3258f2a10234186da0b340a51c3d8aa425c1d06c5365e0df7da9