Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c98e5acc10b677…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 04:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ff7515b8a24071f0c169bb046d9e55aa SHA-1: 3c52990b314eca56808eab8a34634b33b083416c SHA-256: d0c98e5acc10b6772307ae03d7627052345b8d3ae6aa92740ce611ee43fb7985
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files on potentially compromised websites, indicating a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://kanat.com/upload/ckfinder/files/sagejupugodarez.pdf In PDF document text
    • http://kleni.cz/userfiles/file/1343626940.pdfIn PDF document text
    • https://j26clean.com/upload/files/kekukolusamubatobi.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/tazeb.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/68661337493.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/batev.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/64506190534.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/popirasibusu.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa6798af9---bipixaroluxogi.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/bupedupifoboxapuwul.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/19647775762.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161321db7c36ab---gubiletikefawuxotik.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34458435058.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/javolos.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/64548859982.pdfIn PDF document text
    • http://nsaimmigration.com/userfiles/file/namesizazikotapusosilul.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/79813675931.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210905081617.pdfIn PDF document text
    • http://poorclarescork.ie/images/70788053795.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/xitup.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/59664034018.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/sidotorap.pdfIn PDF document text
    • http://montesantangelo.it/files/files/31553222208.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/mukexak.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/21784712469.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210902_1F6769F14CB648FC.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+move+apps+to+sd+card+android+8PDF link annotation
    • 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_off0000d8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AA 10980 bytes
SHA-256: 958f249cf064d5922c84761f7177fc71a33fa59d6f67b9aa2615e9b1a8038db0
font_01_sfnt_off0000f229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF229 17452 bytes
SHA-256: 6e423a5f02aef4f8a992c8aaa28a68d839eb80f8cf496d4744667bd3bb332dc6
font_02_sfnt_off00011f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1