Malicious PDF — malware analysis report

Static analysis result for SHA-256 31035618e01b8890…

MALICIOUS

PDF

85.5 KB Created: 2021-10-19 23:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 99bd944ac8576abe11bcb0e77e119d38 SHA-1: a9495cc46c6bc3978f1405174e8cf69d365b5f5a SHA-256: 31035618e01b8890ece2f3e9347c75ab1f0ded27202b961440fd1741ca13df4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://retailpark.bg/uploads/wysiwyg/files/raximolunivewopok.pdf In PDF document text
    • http://kapsalonindex.nl/images/uploads/mekaxitixuduk.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/78669825101.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/tologime.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/julidifemimamodixiro.pdfIn PDF document text
    • http://sooclose.eu/upload/File/vejidatowedububow.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202110061608342601.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/79677126549.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/42750470088.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/vinesebugumulituzetezapez.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2c16b8a0098ed1d916b4d94a27dabdc7/38940565842.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/61636476843.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/76556704883.pdfIn PDF document text
    • http://tochuchoinghi.org/files/rikaxigibex.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/30756937049.pdfIn PDF document text
    • http://ysenb.kr/board/file/editor/file/misuvubagegasu.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/doganaguvumaxugiz.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/nenevidezili.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/59364247075.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16167655bd81c1---24875712887.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/pibepanumulumotewedafuxa.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/dabez.pdfIn PDF document text
    • https://badrivishal.com/media/50807028492.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109210524292605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/TSvcnjQ06Jg/uplcv?utm_term=personal+trainer+game+guidePDF 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_off0000e5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C6 18668 bytes
SHA-256: 6035eafbe5e07222bb1c943a97aa08ca289468fd6a2f695a0e26a51cd0319206
font_01_sfnt_off000116bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED6 10692 bytes
SHA-256: 020ad2d29fc75eedb9a03d12fe7aa37cce165d3d94dc4f108face25a19195dad