Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1ce0ace550a61c…

MALICIOUS

PDF

71.2 KB Created: 2021-09-10 06:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6d0039e25e76b9a434782571661f8dae SHA-1: 94cc566ec3e7146bcfde00ac7660d5f81982f127 SHA-256: dd1ce0ace550a61c286b153551d81bd6c759756cbff4504cdeb87a8866785e80
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 that point to a link farm, suggesting an attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a large number of links on disposable hosting. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://hometextiles-consultant.com/ckfinder/userfiles/files/bibobuzobazuvuxodevabof.pdf In PDF document text
    • http://circolonauticofavignana.it/userfiles/files/42388188455.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/tolov.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/94781337726.pdfIn PDF document text
    • http://gibisch.info/files/files/wuruvor.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/2874213084.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/tapepaxap.pdfIn PDF document text
    • http://infosierra.es/images/editor/43267429746.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/ximoxorotobaxitowotap.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2c8cc7940---zumenogobubezuzunovuz.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/buzuji.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/19765092206.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/redamonukibigufeviguz.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210903060050.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/12517716335.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/tegakeg.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/14376691809.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/81575360431.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/zujukanigekizebumokupi.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/muxotobum.pdfIn PDF document text
    • http://zenithmetals.com/files/gitowofuduwetifirik.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/viserepo.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/dipojexodit.pdfIn PDF document text
    • https://anakmeong.com/contents/files/xigemuladadu.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/wosororiwidazox.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/a028d8dda0fdc3ed6b2aa7053070faff/lejuvafatudegifaboraro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=android+turn+off+sound+notifications+for+appPDF link annotation
    • https://mediaget.com/userfiles/files/verifofofi.pdfIn PDF document text
    • 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_off0000ba17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22E 10516 bytes
SHA-256: b61358cae1b0f9971dabcc6214915f4df31ec6db4e9424c881504e336ccf1a38
font_02_sfnt_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 14652 bytes
SHA-256: c7547e80633d8976d8a960dd3ddca54bcd58fcc7f28089c339f79db8d420ad25