Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bfc195cd9530eea…

MALICIOUS

PDF

67.8 KB Created: 2021-03-22 05:22:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a2f53514b04585f2754f5d5e06c324f2 SHA-1: e91fca3748c4bfba50b294c4b44384882d9f9a80 SHA-256: 8bfc195cd9530eeace3a84bd66a91e4a5a2b8f9beb2326e23ea802fd7a7e55d0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal a large number of external links, suggesting a link farm or redirection mechanism. The primary external URL, https://kuzutuzo.ru/strik?utm_term=sexual+and+asexual+reproduction+in+plants+worksheet+pdf, is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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=sexual+and+asexual+reproduction+in+plants+worksheet+pdf PDF link annotation
    • https://mamufitixiru.weebly.com/uploads/1/3/4/6/134640278/6137985.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450037/normal_5ffc1f6509a51.pdfIn PDF document text
    • https://tetemubegogik.weebly.com/uploads/1/3/4/4/134443084/tusivimuk-mumabofudil.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/20586911006.pdfIn PDF document text
    • https://malegudupo.weebly.com/uploads/1/3/0/8/130813961/3619644.pdfIn PDF document text
    • https://webexopugidoxog.weebly.com/uploads/1/3/4/3/134319438/tadobugedepose-fumadopa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499660/normal_604ca675a3a46.pdfIn PDF document text
    • https://litazotivov.weebly.com/uploads/1/3/0/7/130740097/8533768.pdfIn PDF document text
    • https://dosevabif.weebly.com/uploads/1/3/1/6/131637409/3044885.pdfIn PDF document text
    • https://gulufoge.weebly.com/uploads/1/3/0/7/130776817/6072232.pdfIn PDF document text
    • http://feludekinopotas.scienceontheweb.net/71523256846.pdfIn PDF document text
    • http://gosugas.getenjoyment.net/57825984887.pdfIn PDF document text
    • https://tupokigefadewun.weebly.com/uploads/1/3/4/7/134702618/efa57219.pdfIn PDF document text
    • https://fadatofi.weebly.com/uploads/1/3/1/3/131381363/sifexolope_sawax_kagetipaloturir_begovesanutopi.pdfIn PDF document text
    • https://vurutosefitipa.weebly.com/uploads/1/3/4/4/134479444/varoto_lutururanipa_keretuk_kekumirozegika.pdfIn PDF document text
    • http://piriveva.scienceontheweb.net/78232782428.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/vibasujefir/84952851429.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/97658047044.pdfIn PDF document text
    • http://jojulupijawide.onlinewebshop.net/15507075430.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/vaaste_video_song_3gp.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/kedasefamitesinulukere.pdfIn PDF document text
    • http://pitaken.onlinewebshop.net/canterbury_tales_modern_english.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/how_to_reset_an_edenpure_heater.pdfIn PDF document text
    • http://fazaburifug.myartsonline.com/past_simple_past_participle_exercises.pdfIn PDF document text
    • http://nubibubimalepik.atwebpages.com/babopupuzi.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_off0000ccdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDC 5572 bytes
SHA-256: ca4f0dfdd7310e8e353492eaf7b176f159150463ffdd22b91d1a16d02e41562e
font_01_sfnt_off0000dfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDF 9792 bytes
SHA-256: d6c465002ad4a0a5730bdc2dcc1561bf4761be652e90ba417452bb92a0624c9f

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