Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e925ec7d5a8fa77…

MALICIOUS

PDF

72.1 KB Created: 2021-09-13 18:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e66f89dda2d191fdbda6766eb5cbe2fa SHA-1: 7f42ee371233acee2595de2a1d3c0975753b0358 SHA-256: 3e925ec7d5a8fa7781856b5b5bccedb6bdb48c90da7b77a66b598dffda3743ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of numerous embedded URLs, many pointing to link farms on disposable domains, strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.andreivieru.com/ckfinder/userfiles/files/wosibuvugasepo.pdf In PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/28147836172.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/30904178498.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/fabow.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/49192901746.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/fojajipu.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/49465405119.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/tuweve.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/bokatawifanidosevis.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/resajimuwafegigodewivim.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/46861974625.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/80493899374.pdfIn PDF document text
    • http://valeneighbors.com/userimages/xuvizidozoxofex.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/386091653.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/061009a5f93094b41b1f56a4422ee255/54286408317.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/75374167020.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///1095800407.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/xedagodonuzajoratowo.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/tajurexuvijurureterupobu.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/37767540391.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/newiropiwipijazuvaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=moto+g+power+android+autoPDF 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_off0000b6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DF 17480 bytes
SHA-256: 6d9aad933d9cfde92db0a7c678402ba406d2e67d4513b355aa332ecb649a848c
font_01_sfnt_off0000e3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBE 10532 bytes
SHA-256: 1d5f221eb7ebd5a1eaa225bc6410cd2c4c6791af7c665ed7c665b5aa2b6d3211

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