Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab671da835d6d8e…

MALICIOUS

PDF

68.0 KB Created: 2021-09-25 19:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 961b16ff8e872c629b95ab7b7ef03cfd SHA-1: 32e9187c74eecab287b081c0916aed2aa2cadca9 SHA-256: 3ab671da835d6d8e58ed2b6b685357a56093f09c5c2fbedb3a6442b1ec5fe839
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URLs, suggesting it is used to redirect users to phishing sites or download further malicious content. The presence of embedded URLs and the link farm heuristic further support its role in a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://garglob.ru/uplcv?utm_term=no+internet+access+android+phone PDF link annotation
    • https://cafesca.info/ckfinder/userfiles/files/xutegiganiweboz.pdfIn PDF document text
    • http://gemtown88.com/PicOther/file/222998544.pdfIn PDF document text
    • http://meskerjager.nl/media/files/dalewewapip.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/96989279016.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/sugadipuzulas.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/sozijuwas.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090917314928265.pdfIn PDF document text
    • http://precisao.net/files/files/sidogiguwafobaxunizotid.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b7b67b0a797ed1472075c198b8ae60e2/mazotifuwusikixofen.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/53026169565.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/60354060822.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/89975855074.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/64013555189.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/28719215780.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd84dad913---66922275728.pdfIn PDF document text
    • http://wohingltd.com/userfiles/3414506127.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/38838594970.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/14987409672.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/72516531718.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/98565417567.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/kokumimomunasedojiguvole.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/84200768674.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/81299772466.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210902093754.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_off0000ae7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7D 10540 bytes
SHA-256: 13be469c0366f4e8d5a60b6e063aae689a36c036eaeaf9b1c718313b3872f2de
font_01_sfnt_off0000c66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66F 14472 bytes
SHA-256: 2fbe4d423fb8045c94615f601f9247bf983eb549763c612d752913c88ffaad51
font_02_sfnt_off0000eaa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1