Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4df3a0802d371f…

MALICIOUS

PDF

70.1 KB Created: 2021-10-06 20:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 10e556c9cf0a31155f9b72a147553648 SHA-1: 568d1eb5edc05a842e8237834e67896a3c76ba38 SHA-256: 5d4df3a0802d371fdf8b0b0fd7bc85311f85520d49257eaf4bd8d29212e821b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a non-clustered link farm on disposable hosting, reinforcing the phishing or malware distribution intent.

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://drafthe.ru/uplcv?utm_term=10+frases+adverbiales PDF link annotation
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/32247343947.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/2462184197.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/u16bl2b0g9ufo3f4ifdso2tg5o/74963022093.pdfIn PDF document text
    • http://afinamebel.ukrkarta.ua/fckeditor/userfiles/file/85783338749.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/subugagobiwoxalulopot.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/1210627863.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/dibupamediboraralavoj.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/newitazuluvek.pdfIn PDF document text
    • http://giga.sk/storage/file/60038702475.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/78135015119.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/87738453817.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/lujetirapofuxibunizelut.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161326a31b63fc---60740727485.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/dumikaxuv.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/xupuwepudurodifojujido.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/11228169925.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/towido.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/zipopofogomulusopub.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E6 10308 bytes
SHA-256: 2f1ca084d3f1f1f6eaaabfaea923893f34ddf7f14899fc89deb0264f66b631df
font_02_sfnt_off0000e139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE139 16572 bytes
SHA-256: 733536c954464f8bf76a172332b100d95f4c4fd6e6b42e5614653ad5d0c8d400

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