Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ee032b8bc930916…

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 05:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 89b670b4c5e0a4bf46396c225b428f60 SHA-1: 09330e0a42508ac4e5fa3449805d9482043337d5 SHA-256: 1ee032b8bc930916dc48f968f52a77bd5c0f20946eefac9a5bb67d9f1526d402
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://coretry.ru/uplcv?utm_term=how+to+use+diskdigger PDF link annotation
    • http://stellarp.com/userfiles/files/dekudupedi.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/67990685160.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/5786349327.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/12bjlkrmjmgllqp7418u5lch60/61655193568.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/46562936514.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/97447661564.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/38788916213.pdfIn PDF document text
    • https://razredna-nastava.net/files/raxuzofi.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/gewizowijedavo.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393f9e4c9b3---gufebofusik.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/sonapoteduvo.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210901062613.pdfIn PDF document text
    • http://asustainable.com/global/file/1060980785.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/45012883685.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/6084713753.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/90140251232.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/5083938528.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/74797574982.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/tawugesopoku.pdfIn PDF document text
    • https://777mto.org/contents/files/muselul.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/xalogokume.pdfIn PDF document text
    • https://cubic.is/userfiles/file/33696515807.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/lufigasu.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_off0000d54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54A 10380 bytes
SHA-256: 756ce2746bb69b608b5ba2894e1535dd435b2276b3ffa31c63562d1673e3ca96
font_01_sfnt_off0000ecbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 18708 bytes
SHA-256: d43dffdc086c56b85510bc5f3fe8f9e4ac20662af64fe58e7c223a39068425c4
font_02_sfnt_off00011d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1