Malicious PDF — malware analysis report

Static analysis result for SHA-256 899d997c9143e2c8…

MALICIOUS

PDF

70.6 KB Created: 2021-09-30 15:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6554910b4f7faa967036a39d72804256 SHA-1: 7889bd75a7877e1bcd00fc520ea69380571fef0d SHA-256: 899d997c9143e2c8901089ae7ea86859420efdf285a20fcc7b5a43877e80875f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable hosting and are structured as a link farm, a common technique for distributing malicious content or conducting phishing campaigns. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the final destination through multiple redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://pistant.ru/uplcv?utm_term=lucky+patcher+proxy+server+apk PDF link annotation
    • https://palezieux.com/ckfinder/userfiles/files/lutakatuxi.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/xoresidakuzu.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/4097240122.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/guxetaxub.pdfIn PDF document text
    • http://hotstamping.pl/files/file/kumaginitekifapur.pdfIn PDF document text
    • https://superpart.com/files/piximisew.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/miwomukovodugomojijijoxof.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/23906181308.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/23166960545.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/78667243997.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614439826fdb7---74168057423.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/27671245791.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/66911006716.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/73318064950.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/35123637214.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/99755076080.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/62894520987.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/nubujovepenemojajinobo.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/947ba91ad7b55a39fbe08ccdfa53187e/64089131086.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/womebolexediw.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/jugofevas.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/84604390540.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/kinanataxuvekumo.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_off0000af17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72E 10660 bytes
SHA-256: 5fb51f11f7a50ae08edafbc793b61dbd4c39d5d0c75236eb320102383645d406
font_02_sfnt_off0000dfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 16876 bytes
SHA-256: a09cd0c458baae7b3b97f718c27b8f60a79bb2abfcaf47b65287d4e65b1f53e2

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