Malicious PDF — malware analysis report

Static analysis result for SHA-256 66af92dfacae30b3…

MALICIOUS

PDF

69.2 KB Created: 2021-03-14 21:32:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0795c3bc6974657c946348fc2d80a624 SHA-1: 9a242bc01d1a5f166c471d41a683973522c022fb SHA-256: 66af92dfacae30b3a758cb394264b7c9ef08ccba75891b8a18624555ffe72a9c
156 Risk Score

Malware Insights

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

The sample was flagged by ClamAV and an ML classifier as malicious, with critical heuristics indicating it is a PDF containing a large number of external links, likely for SEO manipulation or phishing. The presence of external URIs and a high number of embedded links suggests an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lozipotod.ru/strik?utm_term=remington+chainsaw+change+chain PDF link annotation
    • http://kifisafobubupo.mygamesonline.org/have_noun_feel_adjective_exercises.pdfIn PDF document text
    • http://lirebuwoke.mygamesonline.org/veredapiwifas.pdfIn PDF document text
    • https://sugowixo.weebly.com/uploads/1/3/4/5/134588459/viweb-mifimiturulako-xatabemewirus.pdfIn PDF document text
    • https://dofemavuxowag.weebly.com/uploads/1/3/0/7/130739836/04cf487f02ea8f.pdfIn PDF document text
    • http://zerkalo-fugicar.website/bowenajeluvokujezotaramittrdhv.pdfIn PDF document text
    • https://kewekekonuv.weebly.com/uploads/1/3/4/7/134732265/kezosi.pdfIn PDF document text
    • http://instapresent.site/ordained_minister_marriage_missouri22wy2.pdfIn PDF document text
    • http://obzorov.site/pride_and_prejudice_online_watch2a6es.pdfIn PDF document text
    • https://polokoxukoneg.weebly.com/uploads/1/3/2/8/132816042/sowasupalimago.pdfIn PDF document text
    • https://mejotozoferu.weebly.com/uploads/1/3/4/8/134866749/nozolibi.pdfIn PDF document text
    • https://niniteju.weebly.com/uploads/1/3/0/8/130814631/2334358.pdfIn PDF document text
    • https://mabelobixos.weebly.com/uploads/1/3/4/6/134621829/f2a75721.pdfIn PDF document text
    • http://lirebuwoke.mygamesonline.org/ncert_english_grammar_book_class_3.pdfIn PDF document text
    • https://pekavodasusoku.weebly.com/uploads/1/3/5/9/135982803/8424905.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/najubu/rugavololusigageroda.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/91444497150.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/transformaciones_shang_tsung_mortal_kombat_3_ultimate.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/84122036458.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/pop_songs_flute_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/xonuxunuvozekavomirukajit.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/compliance_training_policy_template.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/sustainability_performance_reporting_financial_metrics.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/sumbangan_kerajaan_abbasiyah.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_off0000d136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD136 5184 bytes
SHA-256: b8b063529cf465f07bc75e33a83dcba8abb8f09b581a1317304c2d5d023d7723
font_01_sfnt_off0000e2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 10728 bytes
SHA-256: f01184b2304ec0ce87fcbb72db648614d524de957d89b447b90ea27a11a05248

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