Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae90cc420029c219…

MALICIOUS

PDF

87.1 KB Created: 2021-09-13 18:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a386f5caa6850626f65193f91621c4ee SHA-1: a77443d1e9a11e8c7dbb6eb7ecdd6bb7199afb88 SHA-256: ae90cc420029c219fee8fe0f044b7a58d999b28bd2860f5abded4e65f135a965
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to multiple external PDF files hosted on various domains. While no scripts were explicitly extracted, the presence of numerous external links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ecpa.fr/uploaded/file/12110716247.pdf In PDF document text
    • http://partner-support.net/user_data/userfiles/files/87038085396.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/92856360671.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2b97e2b39---kazokevezefekedefasadave.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/78149366733.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/vapagaroke.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/9348136925.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090123011678.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/49565811761.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/93898891388.pdfIn PDF document text
    • http://keramann.ru/uploads/files/mekazoverunaniwekof.pdfIn PDF document text
    • https://yifff.se/userfiles/file/15450747684.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/79367911040.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/nadibi.pdfIn PDF document text
    • http://safarang.com/basefile/files/fefivepedivalogopoxegex.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/4850395596.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/newemidet.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090719571773499.pdfIn PDF document text
    • http://newbiiz.com/upfiles/file/28425787076.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/resafubamavalenelikawuru.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/6ghf37n9pfe2to50ru2n261ktp/65223760470.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/novepodiripoxukaki.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/76689530181.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/92473362181.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/wenib.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/mixazomixupukawisudola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=rockstar+games+android+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_off0000f207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF207 10948 bytes
SHA-256: 8d4ffe46d3fe1728e4bf0d24d842180b35339d35eb72a6b253dd7f5d4f1a27ec
font_01_sfnt_off00010b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3E 16752 bytes
SHA-256: bef6fa64dd1ac393d068f8016d28a8932a8e0ba508916f8d95d3fd4225840db1
font_02_sfnt_off00013677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1