Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1dbe2baf1ca356…

MALICIOUS

PDF

79.3 KB Created: 2021-04-18 14:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 238364818e6eeb2c96682e29d6b01ed1 SHA-1: 909a8ccd5d6e7ea0c6ec460c39dcf5c9e83f667c SHA-256: 0b1dbe2baf1ca356a0a871ce25c58d6f220cb436e947249e6b784d4e796b5278
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong likelihood of phishing or scam activity. While no scripts were explicitly extracted, the PDF structure itself facilitates the embedding of malicious links, aligning with T1566.001 (Spearphishing Attachment) as the likely initial access vector.

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 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://druttle.ru/strik?utm_term=brother+cs5055prw+accessories PDF link annotation
    • http://xazonojader.mywebcommunity.org/beginner_crossfit_workouts.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375886/normal_5fff5ebec8b1e.pdfIn PDF document text
    • http://gloslides.com/android_tv_box_emulator_for_pc6zose.pdfIn PDF document text
    • http://pesetatin.iblogger.org/jafodirapidu.pdfIn PDF document text
    • https://kinamolifurepe.weebly.com/uploads/1/3/2/7/132710726/javepuladatibeg.pdfIn PDF document text
    • http://rafale.store/materi_kuliah_akuntansi_biaya_lengkapdjbqa.pdfIn PDF document text
    • http://jiwabozaxexe.mypressonline.com/vobijalap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493221/normal_5ff322614239e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455639/normal_5fe02c4b29d76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386828/normal_603c607935e33.pdfIn PDF document text
    • https://ledijonag.weebly.com/uploads/1/3/4/6/134689342/nisonudokoro.pdfIn PDF document text
    • http://vodizurulenega.mypressonline.com/vujipiniwatukez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487647/normal_5fd0599484982.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454982/normal_5fcd6e486a43b.pdfIn PDF document text
    • http://mon-cmbretagne.com/bodivobexinegiduwugatujirncu4d.pdfIn PDF document text
    • https://badakawage.weebly.com/uploads/1/3/0/9/130969543/tuliripi.pdfIn PDF document text
    • https://losewilim.weebly.com/uploads/1/3/4/8/134854933/sabom.pdfIn PDF document text
    • https://kisogegexene.weebly.com/uploads/1/3/4/3/134374262/gopoxiz-lipapitev-desupo-mowokekiwumegum.pdfIn PDF document text
    • http://fufejezonodim.mywebcommunity.org/kifekofepekiwevakozaleno.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vidugozu.atwebpages.com/modul_belajar_photoshop_untuk_pemula.pdfIn PDF document text
    • http://repeputowuz.epizy.com/manualidades_para_halloween_reciclado.pdfIn PDF document text
    • http://rijogutigoxek.epizy.com/aristteles_etica_a_nicomaco.pdfIn PDF document text
    • http://wadekazu.epizy.com/jet_tub_doesnt_work.pdfIn PDF document text
    • http://tukorokibenej.epizy.com/automatic_call_recorder_pro_apk_mirror.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_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 5396 bytes
SHA-256: 71e79d61d818c39e68593ccf22e862650fe27d4586149046eba474eefdcc99ce
font_01_sfnt_off00010cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBD 10368 bytes
SHA-256: d52171287c90017ba2242050634933fa3d5d76d41a1c5d19a1477af0f98a2c62

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