Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91617f8b48aed1a…

MALICIOUS

PDF

71.6 KB Created: 2021-03-07 19:01:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 939faccc8491952fd02b9732efcf082e SHA-1: 1c5e2671fc64e1d507e6c7376d8878a5cfd9c06d SHA-256: a91617f8b48aed1a6adc561add7953da07bd77371fb339cca9a78bd440748ef2
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external URLs pointing to other PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://soxebez.ru/123?utm_term=tippmann+a5+folding+stock PDF link annotation
    • http://wuvevaj.iblogger.org/azitromicina_900mg_bula.pdfIn PDF document text
    • https://pufoputinagof.weebly.com/uploads/1/3/4/2/134234879/4661587.pdfIn PDF document text
    • https://gimisezijumini.weebly.com/uploads/1/3/1/4/131453276/7939219.pdfIn PDF document text
    • https://pafovawulawagi.weebly.com/uploads/1/3/4/5/134581771/5729389.pdfIn PDF document text
    • http://lutokororale.iblogger.org/mosbys_questions_and_answers_for_nclex-rn.pdfIn PDF document text
    • http://xigosilefonaboj.iblogger.org/62976247007.pdfIn PDF document text
    • http://tulakijumipad.22web.org/xufivegenenixewikarojisot.pdfIn PDF document text
    • https://nerupeke.weebly.com/uploads/1/3/1/4/131483009/892ac9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_0e79ff6c26cf435594c2765b73bf5151.pdf?index=trueIn PDF document text
    • http://fikikozazilut.rf.gd/soxusupera.pdfIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_984e42fcfc384494a294c69b2465d58c.pdf?index=trueIn PDF document text
    • http://povuputuk.epizy.com/yamaha_ypg-535_keyboard_review.pdfIn PDF document text
    • http://rudavuzapu.rf.gd/94896029687.pdfIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_fe510bd7acdf4b3689c84e3142907481.pdf?index=trueIn PDF document text
    • http://judafigot.rf.gd/16904185859.pdfIn PDF document text
    • http://wadumoseri.rf.gd/73898029247.pdfIn PDF document text
    • http://vopuxoke.epizy.com/bombsquad_for_android_jelly_bean.pdfIn PDF document text
    • http://wererivukij.epizy.com/bimanual_coordination_definition.pdfIn PDF document text
    • http://kaluzepo.rf.gd/minority_report_stream_free.pdfIn PDF document text
    • http://zutadelunixirot.epizy.com/35221454951.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_off0000d8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FE 5516 bytes
SHA-256: 5d85a73f1785fa5b7937869cab45750219b43e0ab737bc48bfe5b0107e4c37e6
font_01_sfnt_off0000ebba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBA 11044 bytes
SHA-256: 7de74e36994be6c5b40fd32aed8d91d0f3f8484d8252e830b460d0d800d81e0b

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