Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8623cf3b3526b40…

MALICIOUS

PDF

77.0 KB Created: 2021-03-12 14:06:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7e53bced44fbd6d9684f812759aaff9d SHA-1: 1f939f2fe8d050e5342925afd53138f8798d2db0 SHA-256: d8623cf3b3526b4002b91578c0c15e9616010fe1d8ff4a4e0e60d9c5b5a2eac1
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 0.9990

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://midufefew.ru/123?utm_term=verizon+fios+tv+guide PDF link annotation
    • http://vumegebopim.iblogger.org/60748734133.pdfIn PDF document text
    • http://siputofivimib.iblogger.org/collar_x_malice_bad_ending_guide.pdfIn PDF document text
    • https://jimixinig.weebly.com/uploads/1/3/1/1/131164312/jivoxeran-zavusivo.pdfIn PDF document text
    • https://kisezuxuromo.weebly.com/uploads/1/3/0/7/130776201/womike_dafebinawan.pdfIn PDF document text
    • http://tejaberi.iblogger.org/critique_of_pure_reason_by_immanuel_kant.pdfIn PDF document text
    • http://vosusapar.22web.org/32345428452.pdfIn PDF document text
    • http://nudiluderovemi.iblogger.org/air_pollution_causes_and_control.pdfIn PDF document text
    • https://bolowotusupiwam.weebly.com/uploads/1/3/5/3/135300352/zokidigo_rugufab_divexa_tekagek.pdfIn PDF document text
    • https://selamosufuk.weebly.com/uploads/1/3/4/4/134463567/gimuwutote.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/zazeputinujubof_tikosovi.pdfIn PDF document text
    • https://dirasikazeta.weebly.com/uploads/1/3/1/3/131379856/devofopa.pdfIn PDF document text
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/tinavuteponox_remimezufazu_xunitekosabu.pdfIn PDF document text
    • https://vebilikowuti.weebly.com/uploads/1/3/2/7/132740371/bukasifular.pdfIn PDF document text
    • https://fufaguda.weebly.com/uploads/1/3/0/7/130739251/7681242.pdfIn PDF document text
    • https://suvadigefutom.weebly.com/uploads/1/3/1/4/131406455/pibof.pdfIn PDF document text
    • https://lebotowim.weebly.com/uploads/1/3/1/4/131438344/155f949f5b68.pdfIn PDF document text
    • http://rakuxijewimafud.22web.org/qr_scan_barcode_apk.pdfIn PDF document text
    • https://jotesufuxave.weebly.com/uploads/1/3/1/4/131483421/8536408.pdfIn PDF document text
    • https://bupuvebawa.weebly.com/uploads/1/3/2/7/132740405/dejuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wofebedemus.rf.gd/xularenotanupisulipuka.pdfIn PDF document text
    • http://webepapaz.epizy.com/patofisiologi_hernia_inguinalis_lateralis.pdfIn PDF document text
    • http://velefejaforafe.rf.gd/bloody_roar_3_android_apk.pdfIn PDF document text
    • http://zavujosabojid.rf.gd/cydia_android_lock.pdfIn PDF document text
    • http://duxuramubot.epizy.com/bobbi_brown_cosmetic_line.pdfIn PDF document text
    • http://bidanata.rf.gd/36172053417.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_off0000f0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 4908 bytes
SHA-256: 79a7a43b9ac1076a021cefa6c61b020dddca64715d5ac92d24e858856d39d666
font_01_sfnt_off00010196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10196 10732 bytes
SHA-256: 52bd56a45ce6353f5dda992e4cafad5eb3837a6242eb543f4f025607f8d1aed1