Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e71d89e2c58f34e…

MALICIOUS

PDF

72.0 KB Created: 2021-04-03 18:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8993f3edf409ac5be0ec79166d2dac63 SHA-1: b4bee102eaa0bda9f6b67b51d46c552ed5008614 SHA-256: 8e71d89e2c58f34e0f3027cb4d5afe611fd400c04f6d0edb92e8710827b27d61
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a large link farm pointing to potentially malicious content. The primary lure appears to be a 'financial maths year 9 cheat sheet', which is a common tactic for phishing or distributing malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely involving redirection to compromised or malicious sites.

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 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://xajibur.ru/strik?utm_term=financial+maths+year+9+cheat+sheet PDF link annotation
    • http://cabinetsapp.xyz/kapamopemexosokewewuwfzyg5.pdfIn PDF document text
    • https://kisuvali.weebly.com/uploads/1/3/1/1/131163683/3904763.pdfIn PDF document text
    • http://study-english-05.site/boy_scouts_of_america_bankruptcy_case_numbery2h6g.pdfIn PDF document text
    • https://nuwevalixur.weebly.com/uploads/1/3/5/9/135990129/wulivamudosofalemek.pdfIn PDF document text
    • http://phrensy.co/wills_eye_doctors_in_delaware7yaqw.pdfIn PDF document text
    • http://helen-art.ru/81879783658sox64.pdfIn PDF document text
    • https://ronurakegilapoz.weebly.com/uploads/1/3/4/8/134852428/retusedivutopijoz.pdfIn PDF document text
    • http://ru-order-687646765445.art/3134071746hd05a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muriporufulov.epizy.com/bmw_e28_electrical_troubleshooting_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/zigatisofulawazesesale.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/falsettos_sheet_music_book.pdfIn PDF document text
    • http://bibarixe.epizy.com/91001078517.pdfIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_b40332eb7cae4a8189f5110b1166573a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jipowumat/morimanezarofupopegal.pdfIn PDF document text
    • http://gadudadu.rf.gd/aiag_apqp_manual.pdfIn PDF document text
    • http://nirepuxakidogu.rf.gd/obras_de_camilo_jose_cela.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/fejus.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/tenses_worksheets_for_class_6_cbse.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/47782592286.pdfIn PDF document text
    • http://fofapisavinuf.epizy.com/resmed_bipap_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/comcast_email_not_working_on_android.pdfIn PDF document text
    • https://66e0d7df-d9e6-4599-8f92-a47fa3a4044c.filesusr.com/ugd/8b97dd_00c1066810624ceeae6dd05461ffc4e8.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 5252 bytes
SHA-256: 83aaca5869f718edc6dcc91079b6794268dbf611a5cc9795e8ffbde6c2f20bf6
font_01_sfnt_off0000e8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 11808 bytes
SHA-256: dedea288a48466a5cbdde510eeef697174375c4d46af09d4724bb6832df97a69

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