Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d176f7e92bdd7e…

MALICIOUS

PDF

83.3 KB Created: 2021-10-08 19:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1caba347eb63b4258ac2928c15269fde SHA-1: 3bb0890012edb4d15db539412b7f2aec7005d41b SHA-256: 44d176f7e92bdd7ef78a33e29cd752cd97e054f910e4c495f8d9a3b8cb02dade
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external PDF files hosted on various domains. The presence of many distinct, potentially disposable hosts suggests an attempt to obscure the ultimate malicious destination or to distribute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://buyafranchise.org/files/files/jajaborilubosigupifix.pdf In PDF document text
    • https://zd-zeta.com/uploads/files/202109080244235362.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/29536099329.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/14533681986131f3b54e2ef.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/semodilizipoxedizeg.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/rugararabonelo.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/gewitepevosanadak.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/34132904575.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/vilivelofupiz.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/potusaxenumuz.pdfIn PDF document text
    • https://krusomying.com/data/file/16138296631.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/8ov5gs3cfeh31h7n541lrgfoql/gerulivezepobobuwi.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/35281594971.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bcbd2a980---70637261588.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/22287198140.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/dawaj.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/99255758528.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/mosekizivabirezegesixu.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/73941124970.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/jebinavusemosanim.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/70180978255.pdfIn PDF document text
    • https://www.food-equipment-store.com/fckeditor/uploads/file/zedagowu.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210928112539998289.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/22094510714.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/katomirejadozifubimubuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=le+muy+francePDF 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_off0000db6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 21288 bytes
SHA-256: 21a237a2f73b8611490e7872b12f4c94b5456629c4e6d372303c88cb291befad
font_01_sfnt_off0001115e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12975 10144 bytes
SHA-256: f693e4e6eb4ab4b6debee076c2c58aa38d93622b62f042aea330280ddcbb7f54