Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5e498836c5c998…

MALICIOUS

PDF

78.6 KB Created: 2021-05-16 04:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 51eee06a33c4e739e7afd50c954db9fb SHA-1: a7ae3990822935950434853753cfa87cc957732f SHA-256: cf5e498836c5c9980b5d6dbc28a8a17320e93ad88bb80d6ca4f75c927c6c5bab
186 Risk Score

Malware Insights

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

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 0.9995

Heuristics 6

  • 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.
  • 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://ponafet.ru/strik?utm_term=the+color+of+magic+word+count PDF link annotation
    • https://varepanuror.weebly.com/uploads/1/3/5/3/135394497/dazeni_lopado_wizepuwapo_ledajarizetov.pdfIn PDF document text
    • https://xepesirivow.weebly.com/uploads/1/3/1/4/131408502/sukokubukumuposiw.pdfIn PDF document text
    • https://zukixemafeka.weebly.com/uploads/1/3/1/3/131398149/3258979.pdfIn PDF document text
    • https://bilokomomaxin.weebly.com/uploads/1/3/5/3/135397692/gopamiziropujomexe.pdfIn PDF document text
    • https://kelonefak.weebly.com/uploads/1/3/2/6/132683111/wizarisapusuvanu.pdfIn PDF document text
    • https://zenojunaguj.weebly.com/uploads/1/3/4/6/134668508/nasarez-damagedazolose-sigisuz.pdfIn PDF document text
    • https://ranekiwoj.weebly.com/uploads/1/3/0/8/130814960/3689976.pdfIn PDF document text
    • https://gulekikafosevog.weebly.com/uploads/1/3/2/3/132303175/921e41825c.pdfIn PDF document text
    • https://janilanupaga.weebly.com/uploads/1/3/4/6/134673225/4264752.pdfIn PDF document text
    • https://wowavimisaken.weebly.com/uploads/1/3/0/8/130814021/desoxovapoled_begolatemites_situmekenete.pdfIn PDF document text
    • https://xerupirep.weebly.com/uploads/1/3/1/4/131408033/69c14f6fe.pdfIn PDF document text
    • https://gazobibulome.weebly.com/uploads/1/3/4/7/134775133/491727123b7a54.pdfIn PDF document text
    • https://vilegewadaw.weebly.com/uploads/1/3/5/3/135324537/81ea53ee.pdfIn PDF document text
    • https://jisasulozif.weebly.com/uploads/1/3/4/3/134371627/kibemuluzekegedovoge.pdfIn PDF document text
    • https://kafolegilu.weebly.com/uploads/1/3/2/3/132303068/bofowesusola.pdfIn PDF document text
    • https://xekekulok.weebly.com/uploads/1/3/1/8/131857590/1015050.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zurutoraxavifes.rf.gd/fosalixilajekor.pdfIn PDF document text
    • http://tufewoxawaw.epizy.com/how_to_starbucks_frappuccino_bottle.pdfIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_aa7901a707fd434586782580758fce15.pdf?index=trueIn PDF document text
    • https://681956c7-2c57-495f-b996-d04b50c745b0.filesusr.com/ugd/907d98_fbd035884605498ab72739926dfa0c59.pdf?index=trueIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_93adcfa7b51f4c05ad2733230044a2b1.pdf?index=trueIn PDF document text
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_a6f2efe7ef184e599d8253d9014f56cb.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDF 5180 bytes
SHA-256: 0c8e55ff8cc077fb693ac9940253c7f064322daad09ab2501cc36a6cc8ba8726
font_01_sfnt_off0000fd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5B 9948 bytes
SHA-256: 31a3072ae2975190a43e794c94c1f11065973491b771c86db5aeb506c6cf63e4
font_02_sfnt_off00011eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEB 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333