Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9fb1a97a431e963…

MALICIOUS

PDF

89.9 KB Created: 2021-09-13 01:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a19b6e83e1182d4707bd6f4880ddc378 SHA-1: 1fdc691427876e16fd6aaf15ab851b9a71dda518 SHA-256: e9fb1a97a431e9630c3ada9393a1c7d56091f8e57839db7ae9913f711cec47e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting an attempt to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the final destination. No scripts were extracted from this sample.

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 https://sukienmiennam.com/userupload/files/28522174866.pdf In PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/1341303425.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/40184051840.pdfIn PDF document text
    • http://guowangcable.com/d/files/gokipagumim.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090617504373499.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/kimebitabiteseru.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/dijodudokumubijoraxezoro.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/71087142555.pdfIn PDF document text
    • http://bscartridge.com/pic/xafuzesam.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dff569f6c8---zirelozerovevurodib.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/duwizixatajenezarorolor.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/nubixijedewalokaresirir.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/37794344503.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/66937975241.pdfIn PDF document text
    • http://belovosushi.ru/files/fekisex.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abb0d946a8---regozera.pdfIn PDF document text
    • https://rippa.pt/files/file/61622761631.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/17590980204.pdfIn PDF document text
    • http://laserinnsbruck.com/static/pipefofudelag.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/47471050224.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/nefovanakoburebam.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/ledozur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+one+you+feed+moviePDF 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_off0000ff12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11729 10288 bytes
SHA-256: f931e92e235fb79e7ffa843964eb9b38bcc48f62a232e91454e07a8754324890
font_02_sfnt_off00012e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E17 17228 bytes
SHA-256: 9dafae85f5a3ec6f3878a56f5aa815d1c74877822e0db04b9aa6ae454b310876

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