Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c9540ef995c88ba…

MALICIOUS

PDF

76.2 KB Created: 2021-04-13 14:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 784075459636873a95944c6b9dbd902a SHA-1: be1b0051871cb244f8a718e2b933d9cab3f5f8d4 SHA-256: 2c9540ef995c88baf2acfc180af14e745408086b8e4e7fe07824a1c9beb1fa3b
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external URIs, many of which are hosted on disposable domains. The PDF's content, though heavily obfuscated, includes metadata suggesting it's a link farm designed to redirect users to potentially malicious sites. No scripts were extracted, but the presence of multiple external links indicates an attempt to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=teoria+de+las+inteligencias+multiples+libro+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465389/normal_5fe235d33880e.pdfIn PDF document text
    • https://tigasuzile.weebly.com/uploads/1/3/1/3/131379741/doretit.pdfIn PDF document text
    • https://zoxaxutonixada.weebly.com/uploads/1/3/5/9/135957052/wevis.pdfIn PDF document text
    • http://razvivatel.blog/mabinogi_exploration_levelwf3ft.pdfIn PDF document text
    • http://getegenufiduso.66ghz.com/estilos_de_aprendizaje_kinestesico_visual_auditivo.pdfIn PDF document text
    • http://tryici.xyz/8016570347frmf7.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://hermidkovo.info/blood_of_elves_audiobook_freengh6o.pdfIn PDF document text
    • http://zakofuta.66ghz.com/rofak.pdfIn PDF document text
    • https://wilukogata.weebly.com/uploads/1/3/5/3/135388132/jugisokumawuwof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426063/normal_601c9bf05a519.pdfIn PDF document text
    • https://roloruvibufezer.weebly.com/uploads/1/3/1/4/131410818/didimewoged.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475738/normal_6061a097df43b.pdfIn PDF document text
    • https://giwitororozesal.weebly.com/uploads/1/3/4/6/134652081/vaxexe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/patotale/xazivanas.pdfIn PDF document text
    • http://zutibebasonuf.epizy.com/transformation_of_sentence_affirmative_to_negative.pdfIn PDF document text
    • http://xesapekaf.epizy.com/modexolijasejoxolilenik.pdfIn PDF document text
    • http://mavefigekote.rf.gd/75933369632.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/zoderuretokuwexi.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/hungarian_rhapsody_no._2_sheet_music_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/spelling_test_template_25_words_free.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_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 5564 bytes
SHA-256: d60048ce0ef827caa3961f388312a9f4a9fe2b8c16b20bb7463e7d02e73d589e
font_01_sfnt_off0000f992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 11952 bytes
SHA-256: 33856fb5464f0b88c9a78abfdb10f0e77424501d5bbb07a8d00a04a0511f3b6c

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