Malicious PDF — malware analysis report

Static analysis result for SHA-256 827944078d57cf86…

MALICIOUS

PDF

69.3 KB Created: 2021-09-10 12:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e8bed76913180d9c4300bb9cd478bf4 SHA-1: 5d849144720d2db3ada6cfddaf5512854bfd026e SHA-256: 827944078d57cf865a2a7e6d1c90eb346ea27d5dee97506a8fb7fc167c4152b4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure with an image-only design and clickable action triggers. It contains numerous external URIs, many pointing to potentially disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit user interaction to lead them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://bienbao.net/uploads/files/38646041668.pdf In PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/97055262679.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/0banuomsg757k1fsp9eq6qvd5d/jipikaporomorazanitolobo.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/zofadozudetebuvidibe.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/81472479334.pdfIn PDF document text
    • https://j26clean.com/upload/files/zajoxavazeposibowofesepot.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/1639106085.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/jakuxezelama.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/27153223088.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210904151241.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/vanaxavudovenogid.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/mujudiwijodilowubaf.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/75996684992.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f72a99a423f66955e61f3542b0080e2d/xavapaviwokef.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/14304802963.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/87608898586.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/bexajoradunajigosofamo.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/2789374308.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-10/20210910085606666453.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/fagososivom.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/lematozedafuv.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/67335741693.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/84305918407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=gta+5+liberty+cityPDF 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_off0000b4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CD 14192 bytes
SHA-256: 2fccdfb7d673c61808a639d27d3f255da1e9d0abfec1e2607239f4be71394291
font_01_sfnt_off0000d849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF060 10256 bytes
SHA-256: d3cd6a3551e3274773e5efa2009ddf7865509292da0c262ef6b2c25d12233296