Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb9cdca827ebb58…

MALICIOUS

PDF

86.6 KB Created: 2021-09-20 16:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 40801f8e49573011481129ea9c5e6b3f SHA-1: 4008c2187620dd54be3398c9f2abeed47e3b22d7 SHA-256: bbb9cdca827ebb58e82a2334cff827936790d6a3f844952c079fc590e53521fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to link farms and disposable hosting, suggests a phishing or content-luring scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing attempt to direct users to malicious sites, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ijieet.org/ckfinder/userfiles/files/46833061956.pdf In PDF document text
    • http://bulk-supplies.com/userfiles/file/14288534655.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/lolotitumura.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/netafegixubeba.pdfIn PDF document text
    • http://teplospectr.ru/images/files/33602532502.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/46628733278.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/wipiborefexu.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/nupebigasurefexi.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210904_084650.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/10853369197.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/7409278058.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/88167362648.pdfIn PDF document text
    • http://koutingchina.com/upload/files/54847908037.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3ff37427c---24099671984.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376143422df---nubesulupetipagulus.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/46755476666.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/37996673050.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/bikoriwovutiwimukos.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bifod.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/62267248269.pdfIn PDF document text
    • https://ekransamara.ru/files/84758365579.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/19253296891.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/pewibamedipituzezivodasa.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/20742386652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=download+pedometer+step+counter+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_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 10864 bytes
SHA-256: 730b267b171f2c5ac4ce7161cecbbc986b1c70030b251cb4ac30b872c79b9bbe
font_01_sfnt_off0001019e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B0 19344 bytes
SHA-256: 1575bee3d4a511d27ad9547f3b8a29557274d3ba92877c4c7f045a332429c6ac