Malicious PDF — malware analysis report

Static analysis result for SHA-256 a936d1f045b07675…

MALICIOUS

PDF

83.1 KB Created: 2021-09-11 14:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb94d36665572c2c2c4ee6e149a283f1 SHA-1: 5e32d4a2a3dbf3dc5ff9886b4c8cb70ae607b356 SHA-256: a936d1f045b07675b9123a46cdefac3d97ed2b630145608ab8dff32353ba9ee9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs pointing to disposable hosting, characteristic of a link farm used to distribute malicious content or conduct phishing. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=alchemist+book+in+malayalam+pdf+free+download PDF link annotation
    • https://shian-jin.com/UserFiles/files/fagamididudel.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/41865721673.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/bulusagekagosiwujaka.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/duzivuvi.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/vazixifovegeboduma.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/fenesenutabowerepo.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdbb7941c1---43791435289.pdfIn PDF document text
    • https://medpressa.ru/files/file/tefukadavedaxisipo.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tibetare.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/49601856804.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/xasolasaxatududox.pdfIn PDF document text
    • http://langmypham.com/luutru/files/82368172695.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/melewufudirexat.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/42985696190.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/51094264591.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/51684775448.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/zanebujekufadujidon.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/30217462232.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/93167973333.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/jesibeka.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///29075759612.pdfIn PDF document text
    • http://iwort.de/userfiles/file/94657251168.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/17502792576.pdfIn PDF document text
    • http://konberdbio.com/upload/files/69811451986.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_off0000db95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB95 17912 bytes
SHA-256: ac424dc14b45df54763b1a826b32d5f815b12d33445b12be64a086bc790710d8
font_01_sfnt_off000109fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FD 11300 bytes
SHA-256: c81c05c6f1495f1bd4b56fa8bdfea210ed3135589bb8db9e76e6feb737a49136
font_02_sfnt_off00012440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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