Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30d3fe997e40b03…

MALICIOUS

PDF

93.5 KB Created: 2021-09-22 11:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c52fa6bf16dfaac381616e963b0c611 SHA-1: 64eb119a3b1f9c78d51bebd94c0feb9e0dd7d93d SHA-256: a30d3fe997e40b03a57347870a89348149530fe7b67e5562d8fa216f833bda47
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to distribute malicious content or phish for information. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host malicious links.

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://uclerbaklava.com/resources/file/60213538015.pdf In PDF document text
    • http://ratchadatitan.com/UserFiles/File/96681022013.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/78175132571.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/xeparusivuwaravixeguraga.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135a22ede5ea---zoben.pdfIn PDF document text
    • http://katela.net/userData/board/file/90433884637.pdfIn PDF document text
    • https://equinox-e.com/upload/files/4988522574.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/46473362243.pdfIn PDF document text
    • http://baove247.org/upload/files/97361624020.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/1281253193.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/76482971610.pdfIn PDF document text
    • https://estoniapools.com/contents/files/sonepesodilodepevamani.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/kudotarububetiluge.pdfIn PDF document text
    • http://riviera.az/userfiles/file/vejuvilo.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/6054367588.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/92114433492.pdfIn PDF document text
    • http://dichthuatanhduy.com/uploads/userfiles/file/getezerapuwitonukifa.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/takibadurazonozerejije.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/52467789068.pdfIn PDF document text
    • http://npas.ru/pic/file/74779881505.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/57207193084.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/sipumonedew.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/jusonixojusaxapowa.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/folaxotefigegagefurojixiw.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/44446760258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+add+parse+sdk+in+android+studioPDF link annotation
    • 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_off00010560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10560 10608 bytes
SHA-256: 3dc35d37b2b9c2fe4b42ae9111f6fc99e00b64bb062266492b86832f9853f3a9
font_01_sfnt_off00011dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DF 18528 bytes
SHA-256: ccd82b5c6324d1bb1908663ae7da30b29ba4c8cd8f24ceaf16c6a25421ff2fdb