Malicious PDF — malware analysis report

Static analysis result for SHA-256 153a188169458e8e…

MALICIOUS

PDF

82.1 KB Created: 2021-09-22 09:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1aa7a1e6801828ce2cac54f317d91cb9 SHA-1: 0253bd2a99e47b7b3e90d69cc3b0889bedfa9cde SHA-256: 153a188169458e8e4ff350fa47d8a57ac5a1ed5118add7896d2a53080384f135
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://oniceh.ru/uplcv?utm_term=once+upon+a+time+season+4+torrent', are likely used to redirect users to phishing sites or download further malicious content. The PDF structure and the presence of numerous external URIs strongly suggest a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://oniceh.ru/uplcv?utm_term=once+upon+a+time+season+4+torrent PDF link annotation
    • http://iglozawiercie.pl/zdjecia/file/desax.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/zosesaxonuwesufijixu.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/netijebenekelexelu.pdfIn PDF document text
    • http://seed-hongkong.com/uploads/file/jesuzemitomelog.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/28901144370.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/38724792431.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/17156635370.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/73836290726.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/dovexikukotiradut.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/votif.pdfIn PDF document text
    • http://wwsm-us.com/files/file/79959203732.pdfIn PDF document text
    • http://woykoff.hu/upload/file/66806251051.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/elt7fmlagrmr3milolhm23im60/sadetaxuwo.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/45929947249.pdfIn PDF document text
    • https://olterus.net/contents/files/41226157661.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613beefeb332d---vuduvi.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/8461271632.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/24839535521.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/duloso.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/77229267502.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/javuxunejunaxum.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/7929208820.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_off0000d5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 10692 bytes
SHA-256: 70ea19b36b9d8906f74a29e3e491a7d18b7093584ba91d65540b891ffa75cfb6
font_02_sfnt_off00010684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10684 19456 bytes
SHA-256: 0e9d01d19cc305c235cf3d05b9f3c922c51c2f25cafdf2e9f56ab014a7864163

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