Malicious PDF — malware analysis report

Static analysis result for SHA-256 88362913ec171416…

MALICIOUS

PDF

71.7 KB Created: 2021-09-16 02:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e6914c8784a15fd5ea559754a74ef313 SHA-1: e745b2110a0757bd09f99a957c3115ee10304587 SHA-256: 88362913ec1714169134938315edaba06f47c9185ea37833ec7d6b51fb4fb7f7
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of links pointing to various domains, many of which are likely disposable, suggesting a link farm or phishing lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://worldpigment.com/image/upload/File/vidofebajipurudujobubi.pdf In PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/64702308368.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/tozonexifuwopafasor.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/11949471871.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/bunijeripupuwowijipawuz.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/27115165095.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/62991120675.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/jilolozutuxamebureg.pdfIn PDF document text
    • https://hoalavender.net/upload/files/junolaxipasafomabar.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/godosimegilazupe.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e456b6cb11---90937451223.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/mimaronatajuviz.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/95724889545.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/89445319151.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/nositok.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/38957144997.pdfIn PDF document text
    • http://d-innovation.com/upload/files/1063273265.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pavasupozowe.pdfIn PDF document text
    • http://ministerium.pt/files/wibikikerodugite.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/sepatekolulavasi.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/17827048024.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/zitoweromuruwozixi.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/91297178146.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xipuw.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163144600321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+tv+malayalamPDF 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_off0000b96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96F 16032 bytes
SHA-256: 5aa69a3fed0cb35ee7c64310818b9294f9dda87bd89dcea7157c39baf73ab9f8
font_01_sfnt_off0000e2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 9952 bytes
SHA-256: 17c5b3a052fb3fec941bc2ed167d34217b042072804717536185471a1aae25bb
font_02_sfnt_off0000f8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1