Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3f85deb015a27f…

MALICIOUS

PDF

81.2 KB Created: 2021-10-11 12:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6f665129bfa9719db19ee5bde8f6ea09 SHA-1: ceaff1f94f5f3637240c22415e9c3a3fcbc3a05d SHA-256: 4f3f85deb015a27f8c4755f2a4d3eed5f9138c411bdd03b21df11e0d29e492e3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm with numerous external URIs, many pointing to disposable domains, designed to redirect users to other PDF files. This suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://lnimeina.it/userfiles/files/48932628661.pdf In PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/97024699738.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/85988689847.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-26/20210926100403688353.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/54009401709.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210904034614.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/pusuxagijutodozak.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/kazizupu.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/rotomudojup.pdfIn PDF document text
    • http://polletnv.be/uploads/files/19850563624.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/kuvijugofeji.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/73452831479.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/58618170278.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/zovutavoseguxumagu.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/vafajufetuxaterukeluta.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/15879844332.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/bonakijadejujunuvuv.pdfIn PDF document text
    • http://apothepharma.com/upload/files/wirora.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/79617922095.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/64884861606.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/loturuzanuvegupoluli.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/1ceae0ad7bf943096548e96556881a6b/94008677776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/HTGXzuRVGb4/uplcv?utm_term=p+words+with+zPDF 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_off0000d84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 19040 bytes
SHA-256: 66d6122bd57a6ee8b0a5645ffcc0780369910459a5795317b961dcd6f44e030d
font_02_sfnt_off00012123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12123 10048 bytes
SHA-256: a1d9fbcb799310182ec3e0c0a6fa506ecbe7108d69b3e250403424e9a446bf60

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