Malicious PDF — malware analysis report

Static analysis result for SHA-256 3551b8cc8f8ea47e…

MALICIOUS

PDF

76.2 KB Created: 2021-01-24 22:31:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 57553cc672f9c59a0a198eb50f6343bd SHA-1: 1408ab835dd1646988e94c0eee1810c0dad93a69 SHA-256: 3551b8cc8f8ea47e7c1e13aad19157d0af4af48969430261bfc655b7b0fc3b61
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious content. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution attempt. The presence of external URIs and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

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://trafffe.ru/123?utm_term=afk+arena+wishlist+priority PDF link annotation
    • http://1offpark.xyz/phoenix_movie_timesjvzeg.pdfIn PDF document text
    • https://valejuti.weebly.com/uploads/1/3/0/7/130739952/kufidup-bukubipemabivu.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/virus_war_98k_mod_apk_unlimited_moneyjv339.pdfIn PDF document text
    • http://help-violation.com/mysejahtera_login_majikanmkf2q.pdfIn PDF document text
    • http://upgrade4me.com/19078447339lcrxf.pdfIn PDF document text
    • http://mon-compte-cmb.best/68520578062x3fy0.pdfIn PDF document text
    • http://vizionsmc.net/league_of_legends_mod_apk_android_1azvhh.pdfIn PDF document text
    • http://organize.shop/lafevije55sdh.pdfIn PDF document text
    • http://bellissimo.online/flix_movie_theatre_el_pasogd2qm.pdfIn PDF document text
    • https://nodopemewave.weebly.com/uploads/1/3/2/6/132682748/sojenorawati-xotevewe-ninalib.pdfIn PDF document text
    • http://trickyturkey.com/pc_games_offline_free_download_for_windows_10ywxv2.pdfIn PDF document text
    • https://zasevolonuto.weebly.com/uploads/1/3/5/3/135335071/danujubapiwu_diditeni_nixesopofip_witon.pdfIn PDF document text
    • http://onenature.space/illusion_connect_codes_redeemrx42f.pdfIn PDF document text
    • http://drive4mclanemilwaukee.com/godeboxafa3s647.pdfIn PDF document text
    • http://chempion.coffee/murdergame_portable_apk_modrdrz4.pdfIn PDF document text
    • https://taxinureku.weebly.com/uploads/1/3/0/8/130814469/nasewenokutukovomixo.pdfIn PDF document text
    • http://prizinsta365.online/boxolalivoyu8m3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ed9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 5236 bytes
SHA-256: dc440a08cd16427b750826ac35fa233f3039f325692d78a72063b9a3abda0431
font_01_sfnt_off0000ff85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF85 10532 bytes
SHA-256: a582d49b84fd23fa79908ed7c40962e2bc657d427f3cc16c2f193dc4995b2e0c

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