Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bd6783762436930…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 00:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 076c83f96a54fd2c3180b02563e33f9a SHA-1: 8802bc9637231518e12cc55eb2368006942bfc45 SHA-256: 2bd678376243693024094f39f74fc90301a6c0a90701d6508e20ef8e25230255
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, suggesting it functions as a link farm or a lure to phishing or malware download sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a large number of links hosted on disposable domains, reinforcing the phishing or malicious distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://synerhu.ru/uplcv?utm_term=cleo+mod+android PDF link annotation
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/46332017409.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/kibebajagofilaz.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/foguruvaguxux.pdfIn PDF document text
    • http://195exim.com/datas/files/mepalaroxe.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e554007ce3---mofovawepomeluduxamuvek.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/97658343422.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/totagawubegafubebukobim.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/jefada.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/73546802679.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/43931089530.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/xagarizazujusegelapiw.pdfIn PDF document text
    • http://jcpingie.be/public/files/titudananagixasirirules.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/21248591696.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/56165480245.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/gexojufavonibew.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/85505886119.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/wajokumases.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/54162718945.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/sezanolabitus.pdfIn PDF document text
    • http://12shio5.com/contents/files/kekolelumuxapidixewoles.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/gisigasugijatixuv.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/16079315675.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140eebe8c6ba---35802556523.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/guxijegogoxepolo.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/vorulubavozodobelutixekom.pdfIn PDF document text
    • https://yilmazlift.com/userfiles/file/73856151551.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/91354579303.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_off0000b310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB27 10176 bytes
SHA-256: 015f754f81de74b67c91e2781752f5c93689347cbd1c39f780cef9c432059f77
font_02_sfnt_off0000e1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D2 16244 bytes
SHA-256: e2bd1a2dc953f63fb2deafa87320f226d809ccc59ecda6089d0d4534f53a815e