Malicious PDF — malware analysis report

Static analysis result for SHA-256 596139927d697b13…

MALICIOUS

PDF

122.6 KB Created: 2021-03-23 07:53:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0eb0f027602fdc71100346a8515a49fd SHA-1: 5c6e5bf15ea03d2ffa1b6ed89b86c25e566a16f4 SHA-256: 596139927d697b13fe08ad2024c4667ac0c52d75e206b73ebdcd91798ca12a42
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://botokaw.ru/award?keyword=manual+chevrolet+captiva+2020+pdf+espa%25C3%25B1ol PDF link annotation
    • https://cdn.sqhk.co/vorebilifi/cheighf/essential_biology_for_cambridge_igcse_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/maxegugej/jZjeijy/worship_songs_2020_list.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383471/normal_5ff3dc8d30499.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/LvIianS/zatawok.pdfIn PDF document text
    • https://fegexogemitise.weebly.com/uploads/1/3/4/6/134602812/joforumojilubi-bipikamivukugex-fesas.pdfIn PDF document text
    • https://sixoribena.weebly.com/uploads/1/3/4/8/134848884/780355.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/jbkhLbx/mercado_pago_peru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452852/normal_602661af5d5b5.pdfIn PDF document text
    • https://farunigi.weebly.com/uploads/1/3/4/7/134716297/0a519375b.pdfIn PDF document text
    • https://cdn.sqhk.co/xiditado/gf0haDa/75974934644.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469101/normal_5fd90411a1192.pdfIn PDF document text
    • https://cdn.sqhk.co/xasurila/LgiheKn/consumer_reports_best_mattress_avocado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393483/normal_6017598237b8e.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/1125842.pdfIn PDF document text
    • https://cdn.sqhk.co/soxobiwefili/H04Swgj/46791784311.pdfIn PDF document text
    • https://nopeludaseji.weebly.com/uploads/1/3/3/9/133986928/9511005.pdfIn PDF document text
    • https://gafeziluwer.weebly.com/uploads/1/3/4/3/134310472/sezaroti-wimixagebenegu.pdfIn PDF document text
    • https://cdn.sqhk.co/muwizavo/hhibnhi/47956918408.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/nChh6er/54626026625.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480584/normal_5ffe9f87e0778.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/vetamedisoz/wuveg.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/mazda_android_auto_mexico.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/timeline_of_world_history_book_matt_baker.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D82 2996 bytes
SHA-256: 6a364f391a434a5557cdef0a2cada27f82e556da92e373a12c21a31cbd5d2ac8
font_01_sfnt_off00018843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18843 5792 bytes
SHA-256: 271f9b0ac699ad34f95d68b0573761ba4c10eb063b06e4c58efb37df86a9a405
font_02_sfnt_off00019bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BCA 11984 bytes
SHA-256: b54da625a9340083ae031c63a34004116256cac15775b9bf22fabea11b0c7879
font_03_sfnt_off0001c4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4CD 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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