Malicious PDF — malware analysis report

Static analysis result for SHA-256 4339de206f854349…

MALICIOUS

PDF

70.6 KB Created: 2021-10-03 15:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 89371d8503e694458adfdc2a614b6f94 SHA-1: 8f967c6754aedefcb688570db655e872d6964c4f SHA-256: 4339de206f8543491c7e5e8799e5302a8d1160bd5ce5b631bd430535822a6dae
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 and are part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://woodwork.pl/ubezpiecz/obrazy/file/14567442380.pdf In PDF document text
    • http://bajcsidavidfoto.com/_user/file/tekozor.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/20670986156.pdfIn PDF document text
    • http://avemkz.internet-match.com/upload/files/kogeponoxekin.pdfIn PDF document text
    • http://inphilong.com/upload/files/wubojad.pdfIn PDF document text
    • http://tlcjty.cn/userfiles/aa/file///dugure.pdfIn PDF document text
    • http://idroter.org/userfiles/files/98393817685.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/nexetemadexivobevenisewiz.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/korizogorepogefojesaxoso.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16149bea99c91f---mimunetisojega.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210922033711_784249203.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/38266316381.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/165565264961318e4d5f387.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202110021435099056.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/mufozapabudopesosufej.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/73359318166.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/kemizeroxudebim.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/87715946973.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/domuj.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/25981547236.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/89854480737.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137abb395b20---3046393808.pdfIn PDF document text
    • https://harley.dataroom.tw/upload/files/negadanopopagin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=short+metaphorical+lines+about+lifePDF 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_off0000afb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB3 11060 bytes
SHA-256: 4e6486964de489444607b4f90a166a1b5ab174883c4897d01fa9985f589a3f75
font_01_sfnt_off0000c903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC903 17036 bytes
SHA-256: f86bd1a2e24614ae8eedd02986fc66963d1f2656ee53962b8075076540787543
font_02_sfnt_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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