Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78458ffb0327ab1…

MALICIOUS

PDF

79.8 KB Created: 2021-10-07 08:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a45014ffb452099353d093cfd3a7384 SHA-1: 64f1ce55e1644f11fa020aacd0df08ca6200eeb4 SHA-256: a78458ffb0327ab1b4c68269b780910ff5e28176183af08d7206c65e2edc9e9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, with one specifically identified as a redirector. ClamAV and ML classifiers flagged this PDF as malicious, indicating a phishing or malware distribution intent. The presence of external URIs and a link farm heuristic suggests the primary goal is to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=mamas+and+papas+dream+a+little+dream+of+me+chords PDF link annotation
    • http://degrossier.nl/uploads/file/16643641411.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-12/20210912202540627952.pdfIn PDF document text
    • http://delifarm.com/images/file/60575745389.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/kilebal.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/zewima.pdfIn PDF document text
    • http://youil.org/userData/board/file/8203393055.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202110/file/wegaronadevapow.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/80705781981.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210916032805.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/57954565293.pdfIn PDF document text
    • http://seashinechina.com/admin/fckeditor_upfiles/file/2021100407585180554.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/1663362573.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/49715312573.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/piketifuninisifejuxa.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/6095e8fc9433789824b4a025410e4773/senadumasedopoxabej.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/pubedewagifebuloxinen.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/pabakukuziwekeduju.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1632909630551143401.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/kurefinixurubigesarebepos.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/7633413660.pdfIn PDF document text
    • https://wittnebel.dk/file/mozemeposelujobexovoter.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/piburajif.pdfIn PDF document text
    • http://usateatop.com/_upload/files/babosaluk.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_off0000cda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA0 19092 bytes
SHA-256: 84cc8da06f364f68399cf3419fee62e50a27e433bd356132766a93f8d8fcc4e0
font_01_sfnt_off00010008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10008 10880 bytes
SHA-256: e96f63a4c99f5a250f9b6f86307f308f4cc7b8a226dc0dff02ecab730b35df31
font_02_sfnt_off000118e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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