Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dee3107715656d3…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 00:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 105af78d56c8b6c7ea07e9177e2502c1 SHA-1: 31aa34b13912139bb8af74e19c3e218a0b9f9be9 SHA-256: 4dee3107715656d3579b38c48c880056a01215e3f7543180412134b54fca6f53
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. Heuristics indicate it functions as a link farm, directing users to numerous disposable domains, likely to host malicious content or facilitate phishing. The presence of embedded URLs and the PDF structure suggest an attempt to trick users into downloading further malicious payloads or visiting malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://cometsecurity.in/admin/userfiles/file/43127342393.pdf In PDF document text
    • http://novichiha.ru/pic/file/69936194942.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f844268d1c---fominusagufaxutodelurifir.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/gefut.pdfIn PDF document text
    • https://www.anoregmt.org.br/ckeditor/ckfinder/userfiles/files/1568009067.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/xamefobaxiwerez.pdfIn PDF document text
    • http://keramann.ru/uploads/files/68082332911.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2945d820d---jozisurejugezesutiluvi.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109191656338013.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/17432355628.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/vasubadede.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/35464966797.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/zawovu.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/44995953376.pdfIn PDF document text
    • https://egca.fr/userfiles/file/32847221208.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/28581477235.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/gejewepolufaz.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/61549004476.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/mamatemiv.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/jolarafawedojibiludir.pdfIn PDF document text
    • http://forestheightsgarden.com/ckupload/files/79969536508.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/71317993321.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/84493303987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=game+clash+of+clans+hack+mod+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_off0000ad86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD86 15488 bytes
SHA-256: f0862c0d7d067a1c7a9808f1f63edadb715c4a966482049a632a95d39d4f5462
font_01_sfnt_off0000d4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DC 10728 bytes
SHA-256: 22f44a65b0cacb43d64254fef0fc64f17f5efc83bfc2e676a9171c75ab2e91d5
font_02_sfnt_off0000ed56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1