Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3261f6f4484953…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 23:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2cce36b68fbc232a55291fbcb013861d SHA-1: 552c3030263310960b338d982ec725a20c7fe8f8 SHA-256: ab3261f6f4484953439323ce0888894454daebcfc4c1aada62f7d89b7069a787
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to other PDF files hosted on disposable domains, suggesting a link farm designed to distribute malware or facilitate phishing. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure malicious intent through a large number of links on potentially untrusted hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://amkchem.com/upload/files/gasesizironenodufulajoxik.pdf In PDF document text
    • https://watertorens.nl/userfiles/file/33245222705.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/gikejovu.pdfIn PDF document text
    • http://pmke.cz/pictures/files/fafogasuteruviziniwivo.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/biromidu.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347e39e9e87---44376018998.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/51578414466.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/87382781018.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/degepozupuvisijima.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/86983825747.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135aa9cbe4a9---57417865189.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/dosaniwomalekazufi.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/nugedamorasul.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/59215688961.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/getowusagisi.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/97282597200.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/62264302381.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/7934482447.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/80360580211.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/biguwepuguvuwimugakiw.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/9461347423.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/89565204549.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/velawimexijesala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=powerdirector+full+unlocked+apkPDF 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_off0000dee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FA 10724 bytes
SHA-256: 941653b9b514b9df6578d9c36e625dca5c73cd5bfe4033a81b90124fde8e2dc9
font_02_sfnt_off00010fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCC 18188 bytes
SHA-256: 744ade4ce4b8154cb2b49c30698f916c080fbc2cefe25f0b70cba21fa1812c55

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