Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d13a47b9c1c0b99…

MALICIOUS

PDF

87.0 KB Created: 2021-09-12 02:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4eaed99d948c3cacd7e067e51b8a978e SHA-1: 010621ffdfcc38de8e8fc45592c54d518f627335 SHA-256: 1d13a47b9c1c0b99632ea31d66fc1ec1c911e2cd5f709134e71c0883e38aa642
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and form a link farm, suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure malicious links. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it's part of a phishing campaign or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1612f395acbf3c---82388174579.pdf In PDF document text
    • http://newbiesites.com/userfiles/file/63325106928.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/xizidujinemusikorid.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613048bdbe7ac---96317562230.pdfIn PDF document text
    • http://czminghe.com/upload/files/82268270580.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/wodasamatolemefalogiwi.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/xepogemot.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/givobobakoda.pdfIn PDF document text
    • https://comfort8889.com/upload/files/97427163442.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/liwite.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/fuvilesodudulavade.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/gajuguvoraxutekojuri.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/83067701813.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/67210916846.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/zopeveluwiwoteb.pdfIn PDF document text
    • http://ipllaser.in/uploads/94022338254.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/resejavejis.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/3508010689.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/77340820987.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/xugovimimab.pdfIn PDF document text
    • http://hmed.vn/upload/files/40876823574.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/64294113411.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/dedefufajapasunev.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/wibek.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/3418acvcs9el6muqsmhaljc66t/poxagokikotagajilig.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/nokevorojake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=way+of+the+cross+in+tamil+pdf+free+downloadPDF 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_off0000eea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 17940 bytes
SHA-256: 15da94623d0433c70fa63f2a06b74104acfb206c69198eb003d89f63ee95dc3d
font_02_sfnt_off000134be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BE 11080 bytes
SHA-256: e133c9ca406f8f9b9a77fbcc3d8e85db64a6b0d6138ff10081b093363aa78aed