Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e833bc4d7d4f8f…

MALICIOUS

PDF

70.2 KB Created: 2021-09-27 05:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1c934a82ba2acd3c9db64404a1afc4cd SHA-1: e368e54b5fa4a4a4ef0065dff2ac29cf00f1d071 SHA-256: 82e833bc4d7d4f8fb708c36b143ab31775c3db73af4f4c743fbd1e6b05777d15
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to suspicious domains, and is identified as a link farm designed to redirect users. The presence of external URI links and the overall structure suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/27df9910ed3f461a2dc3ab9dcb31cd1f/ruwipixaxe.pdf In PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/pitekodunomitibuzo.pdfIn PDF document text
    • http://asustainable.com/global/file/31709588206.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22258131086.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/paworo.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/fetopulozamisujetigu.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/21975185407.pdfIn PDF document text
    • http://zerosquareonline.com/file/kuderawuxujuner.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/38593933059.pdfIn PDF document text
    • https://tomas-music.com/contents/files/73846842300.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/86806358085.pdfIn PDF document text
    • http://wawa757.com/uploads/files/linurufoj.pdfIn PDF document text
    • http://gruppopolidori.com/upload/image/file/jediworewaguvugosamuf.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/redagizuzidovikabopu.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/bifugugalawujawezu.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/dovatasewujew.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/79870846621.pdfIn PDF document text
    • https://mysilofr.mysilo.com/upload/ckfinder/files/92218263142.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/ropitamonutowomamilo.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/47380722315.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/9595808757.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5f209366d---47476980318.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/sovapejozedojudafutuxugin.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/ligediza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=comptia+security%2B+guide+to+network+security+fundamentals+pdfPDF 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_off0000b11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11F 15524 bytes
SHA-256: 04b35c27e8e545ff4f6f574c983d433969f1cb015948ec1cf5f278c0ceea4054
font_01_sfnt_off0000d824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 11388 bytes
SHA-256: 41bcb91cf1a886490a25b0e03f8222cf10e102c747798c43abc1a3ce2b642d0e