Malicious PDF — malware analysis report

Static analysis result for SHA-256 794494b2ae9727fa…

MALICIOUS

PDF

83.3 KB Created: 2021-09-11 16:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 5f29a307675e709b5e0a9574ff417b32 SHA-1: d2932d6454ab23caed59a1bc8b27ce0bc6b5c525 SHA-256: 794494b2ae9727fa0cf440e295309c23be0e0b3f8e7bb970bc1fe7e08d3464b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=gallery+hack+apk PDF link annotation
    • https://serihosting.com/calisma2/files/uploads/vifeleredupojex.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/34816565196.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/sijusedikisop.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/34561507607.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/31486732248.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/2196028851.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/rigotasidaruro.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/89474038155.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/madewonavuluwiwel.pdfIn PDF document text
    • http://klenderbio.com/upload/files/45032821563.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/46967656744.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/16142490936.pdfIn PDF document text
    • https://areicon.com/images/file/jozaxaxizeke.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/tejadogadizeramebipinu.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/baturoxawekibet.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/tazozel.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/wivefaxade.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/pibozomamifuriloboxete.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/68671436015.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/49295871749.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/tufutifapabo.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/mewekup.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_off0000dda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BD 10136 bytes
SHA-256: bac345c755b7cce13cd775abd1591dffc51ac0d9879c9e99340856cf7de3f108
font_02_sfnt_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 19452 bytes
SHA-256: bb70545c8a28249d7967aae55234b9a87bb8308bb2a7a3b744f6aff47a93aac2

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