Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c53ac4e815340d…

MALICIOUS

PDF

75.9 KB Created: 2021-03-16 19:33:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 197345cd4cc0a6803ba340447f1d1e00 SHA-1: a2c8cdfbb0d7a50bf511d7b6b72fa19703252b52 SHA-256: 21c53ac4e815340de74c78e1c0f8af72004a07568742026d00ab25be048a3a43
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URIs, including one pointing to 'kuzutuzo.ru', suggesting it is designed to redirect users to potentially harmful websites. The presence of embedded URLs and its classification as a link farm on disposable hosting indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://kuzutuzo.ru/strik?utm_term=polygon+worksheets+grade+5 PDF link annotation
    • https://nuzunovi.weebly.com/uploads/1/3/5/3/135314570/83b94a4d7ed4446.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/4jehcgj/ncaa_women_s_soccer_championship_2020.pdfIn PDF document text
    • https://tobopitoru.weebly.com/uploads/1/3/4/8/134872655/rojadaxofibukugi.pdfIn PDF document text
    • https://xuvivodoxanujo.weebly.com/uploads/1/3/5/3/135308848/7338761.pdfIn PDF document text
    • https://cdn.sqhk.co/gediwuwanol/igGvgcf/xumazorasaxajota.pdfIn PDF document text
    • http://radanugogajakax.22web.org/3835036218.pdfIn PDF document text
    • https://gudivolopuna.weebly.com/uploads/1/3/5/3/135346868/b41b0b726d.pdfIn PDF document text
    • https://silavetej.weebly.com/uploads/1/3/5/3/135314504/divexixapigini.pdfIn PDF document text
    • https://namovisurov.weebly.com/uploads/1/3/5/3/135338224/kaxexoliv_tupowiwazat.pdfIn PDF document text
    • https://wusedutewaxugag.weebly.com/uploads/1/3/1/4/131437839/jemijirofotolurab.pdfIn PDF document text
    • https://bufibetotireguk.weebly.com/uploads/1/3/0/7/130739935/nekumevilava.pdfIn PDF document text
    • http://jofifuneku.medianewsonline.com/bekenojememaxafomadibijok.pdfIn PDF document text
    • https://bukodagunotul.weebly.com/uploads/1/3/4/0/134012399/6994992.pdfIn PDF document text
    • http://nebofimanigi.sportsontheweb.net/rodutubekidirune.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/VkC6jiZ/28788630510.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/e0eb37a6-5a2b-4d79-8cb5-6a2036f73389/pemodawobinovunu.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/27467692239.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b94564b3-4677-4040-9981-3b3416e6aa33/lajefazavuwit.pdfIn PDF document text
    • http://pebeminozari.epizy.com/faxitokonojonobebuliwuge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f0ebf3-141e-4a99-a1ab-0db663e55519/sword_art_online_games_pc_list.pdfIn PDF document text
    • http://nanesipub.rf.gd/40_hadith_qudsi_in_arabic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f72ba2c-f901-4caa-80eb-5abfa7fecafc/kadejisegupiwukadibomat.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_off0000e9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F9 5468 bytes
SHA-256: 013d66ba58f926fb5e46c20fe70ddf4b6bfa06505ed6c2feb6089854c523048d
font_01_sfnt_off0000fca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA7 10596 bytes
SHA-256: b24c409041919390c0b36b16c1e5a69abebed4d3eec3d3dfa50fdd1ddfde92e4

Open this report in the interactive analyzer, or submit your own file for analysis.