Malicious PDF — malware analysis report

Static analysis result for SHA-256 078f5d706dd5bfbd…

MALICIOUS

PDF

70.2 KB Created: 2021-02-18 16:35:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c103ad099ff2cbac967ff902380b6262 SHA-1: 2a0bc2ee9715126129fed1dc14c4083ff6c1d331 SHA-256: 078f5d706dd5bfbd233f0ab321d623a921913a53ec7216188f388ea7f5195abc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the presence of a link farm on disposable hosting, with one example URL being http://tasowotata.epizy.com/bloons_td_5_free_iphone.pdf. The primary malicious URL identified is https://baarspo.ru/123?utm_term=how+to+wire+orbit+sprinkler+system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://baarspo.ru/123?utm_term=how+to+wire+orbit+sprinkler+system PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458852/normal_6019272ab7aaa.pdfIn PDF document text
    • http://xinupavob.iblogger.org/91021429476.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365562/normal_5fe4aa7316bfb.pdfIn PDF document text
    • http://pedalini.club/mafujigemewodak88bw.pdfIn PDF document text
    • https://cdn.sqhk.co/govulasem/jh9idif/7653127657.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485696/normal_602c048db91f8.pdfIn PDF document text
    • http://kuvelopomegemes.iblogger.org/audio_visualizer_app_android.pdfIn PDF document text
    • https://cdn.sqhk.co/xolafunodo/YgjhcuQ/firirisunori.pdfIn PDF document text
    • http://faxozulakevosos.iblogger.org/avast_secureline_vpn_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408703/normal_6017595a6e67f.pdfIn PDF document text
    • http://tixomuwenape.22web.org/26475784621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489724/normal_5fdb1e0179f48.pdfIn PDF document text
    • https://cdn.sqhk.co/budatumibowu/gOIibnc/32248169575.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tasowotata.epizy.com/bloons_td_5_free_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/12044979240.pdfIn PDF document text
    • http://wisunomimat.epizy.com/conditional_clauses_exercises_with_answers.pdfIn PDF document text
    • http://nitiparavedo.epizy.com/kokuyo_camlin_balance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/43308805881.pdfIn PDF document text
    • http://xuperag.epizy.com/relajagowaruwikekukeko.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/business_agreement_termination_letter_format.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_off0000d694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD694 5112 bytes
SHA-256: a8d1722e43f18ac4e58f1a6626abeda9e7cdeb9e9015d2bea1b80fcbc801fded
font_01_sfnt_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 10388 bytes
SHA-256: ce91eeda286a1b3e96b011646346b5174c491ccea85339878832fbdc2cde7f92

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