Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0e11ce41d04305…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 20:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: efff07140fcbcfd33fa6bc1e04e0afc6 SHA-1: 7ae2113adeb6f7b4108d5ff4141a784132093264 SHA-256: 3f0e11ce41d04305042831e2a972ad391655a6ef0245e956a82fe2f735b6874f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/b74fe475eb912ea3b79d143e980aa666/38033379488.pdf In PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/20091029396.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/22635183344.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/jufofuruwewikebasuruseso.pdfIn PDF document text
    • https://teamcode.net/upload/files/vexikeloruna.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/xuvaxuninudifimojuwusux.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/ladabeju.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/53215728255.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/lirovagem.pdfIn PDF document text
    • http://innotack.com/userfiles/files/zafisamivedavi.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/wulusorurezobalotibuxu.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/53457680618.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/getixutidupewux.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/seladavusudu.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/99458612322.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210910_025329.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/boxejoketapu.pdfIn PDF document text
    • https://makenie.com/upload/files/25103825982.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/82325979867.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/wekadilit.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/zokoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=c+chord+inversions+guitarPDF 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_off0000d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 10800 bytes
SHA-256: 285d28d660c0789f33e02fc9e69cf8a8de0d03846f4d4881534cda4e84fba8cf
font_01_sfnt_off0000f063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 17516 bytes
SHA-256: 87ebda21947928a6ae24e3b4fcb4c56390bd4f5f4fa861428a7ba7e180f1f900
font_02_sfnt_off00011dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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