Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab2f460bdb1c155…

MALICIOUS

PDF

71.7 KB Created: 2021-09-16 21:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 404651a34a544f31bb775df9cc8504e1 SHA-1: e6717871162b6b41d849ec8df2b408ded8424b5c SHA-256: 4ab2f460bdb1c155d316b5be4f5622e32be5afd3e20ae483a0688c39f0f0c2f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to disposable or suspicious domains, indicating a link farm designed to redirect users. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/juwopapixufugetibugadu.pdf In PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/29821751201.pdfIn PDF document text
    • http://taigesw.com/upload/files/kiguvelerose.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/ledukositujenevil.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/pivozile.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/jikineneje.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109131838408751.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/jopuvujodoporukew.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/31463592550.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/37455782831.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/sijuroxipilutovipa.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/95799711061.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/24235003452.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/gawipepuzojifo.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/92094615554.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/57634746377.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/96645671223.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/91958340272.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/70617354382.pdfIn PDF document text
    • http://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/siborawerowagiriwefinoj.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/84871692723.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/69196505870.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/kefavifiv.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/n105m73gnnd6uqtflv62h1cie7/51565500985.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210902090001.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/77134090174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pinyin+input+for+androidPDF 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_off0000b595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAC 10360 bytes
SHA-256: 2f48fb2c49a288f488702745a969772f32a35371039043a5027c80b4b2eb8e4e
font_02_sfnt_off0000e528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE528 17348 bytes
SHA-256: 6d649dd6431a8939c045735b2db9fe6a5477d43e84036a9935c91e05ff577cd9