Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a392dd5e6a5a99…

MALICIOUS

PDF

88.1 KB Created: 2021-09-16 18:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 243ede552027270791eb560f22c22071 SHA-1: a4fb235b375d9e8349da4a90fb6e2e6fd5b3d2bb SHA-256: 10a392dd5e6a5a9902b4272c5129cdc9ba75ff681709eace01f3873d74898d77
146 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs, many hosted on disposable domains, designed to redirect users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://leprofit.ee/cmsfile/contentfiles/24498066149.pdf In PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/91941993550.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16317482841828820645.pdfIn PDF document text
    • http://warehousetraining.ie/images/saredarumebasedexuwe.pdfIn PDF document text
    • https://viettrungson.com/media/Files/dozil.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/benek.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/xexibatazaxu.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/beratobelilumala.pdfIn PDF document text
    • https://ons-station.com/editor_upload/file/rerunamurawexujatubigutib.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/66334393563.pdfIn PDF document text
    • http://vecsecity.info/editor_up/54521700096.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/da5f6c391c93b783361e10e4a76c8fb1/17609430773.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/92364987036.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/32101769103.pdfIn PDF document text
    • http://suurelepa.ee/data/file/69108762268.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/larigasogibara.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/81552086064.pdfIn PDF document text
    • http://trieuduong.com/images/Download/72602618123.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/giluk.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/46060918950.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161302555b0b05---webose.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/zanakifabunakol.pdfIn PDF document text
    • https://avflash.nl/upload/files/wuzenuzuwejejurel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=c%C3%A1ch+quay+m%C3%A0n+h%C3%ACnh+%C4%91i%E1%BB%87n+tho%E1%BA%A1i+androidPDF 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_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BC 11684 bytes
SHA-256: ee5dcca3058fdf0057c4df2643920dc33f964221bb2e900df92c6de047ef333c
font_02_sfnt_off00011177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11177 33172 bytes
SHA-256: 6b78b2449fd1609b313a432c37531e0a93fd34b07d0b54772fda940db3492375