Malicious PDF — malware analysis report

Static analysis result for SHA-256 01ca433ae586ce6a…

MALICIOUS

PDF

70.5 KB Created: 2021-10-02 23:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8d051021a9ccd72e7af34d154e0b9752 SHA-1: 8945a6a218c135ea2778a5dcefc13413735a1182 SHA-256: 01ca433ae586ce6a38a76c3d961d705740844960f186745fa2e8a07a0b99540d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains or are part of link farms, suggesting a phishing or redirection scheme. The PDF structure and embedded content, though heavily obfuscated, are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pistant.ru/uplcv?utm_term=can+i+add+a+watermark+to+a+pdf PDF link annotation
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/tumirilenepevubam.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/pawemorazururaduzezej.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/gameda.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/pifiwudalapuluvozukamafot.pdfIn PDF document text
    • https://nls.vn/upload/files/44183350098.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cbe91303e8---68313757627.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0902/2d7030402c37d1c34070e5392802b9e4.pdfIn PDF document text
    • http://zeci.nl/im/image/kelalikowukifironut.pdfIn PDF document text
    • https://obchodsezlatem.cz/upload/files/29158634686.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/kozulosajuliw.pdfIn PDF document text
    • http://keramann.ru/uploads/files/gijaxovijaladalubi.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/19364452297.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/66042415855.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/fujorezeluwixudis.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/9624681319.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/97780109422.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/vivonomamakefalajo.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/55999022381.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/togadabusatasitan.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161544ca3137b2---rirozokodolilen.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/18688931717.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_off0000b1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DC 16548 bytes
SHA-256: 61da01139f0809ccfdf3a87d392c84d1b0e0708447b98c25a1e3e2b036129740
font_01_sfnt_off0000dbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 10656 bytes
SHA-256: 2ef8cb6b340f7471869fc54d535c60ce6108225d88706bec8aff7f2325b2d61a

Open this report in the interactive analyzer, or submit your own file for analysis.