Malicious PDF — malware analysis report

Static analysis result for SHA-256 9429441fca6eb5a6…

MALICIOUS

PDF

80.1 KB Created: 2021-09-22 17:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 98556a09f561e7d2f985903dd3b1bf6b SHA-1: 33751beeeb88f76b36113adffc416d51cbd2d119 SHA-256: 9429441fca6eb5a6b485082f2bc7108fef596acaf5ec7a341c1681c943985286
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users. The PDF's structure and the presence of embedded URLs indicate an attempt to trick users into clicking malicious links, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/22008952505.pdf In PDF document text
    • http://szigmetal.hu/editor_up/670739452.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/zixapexudegolo.pdfIn PDF document text
    • http://potya.com/49489785778.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/74221937091.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/widigetede.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/garurijumifukupiguzoda.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/pitifejemizogotepujel.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/buzenepategudiwox.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/87270531463.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/96720155678.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1631089491.pdfIn PDF document text
    • https://robodom.si/files_vsebine/77007700865.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/14491041205.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/37691431601.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/pamofavunokutezexe.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/bufugox.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/21097932566.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136ac2ef0393---44613864321.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/kazenevixejedabapivasop.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/pebemew.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b38966036b---64875117107.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/bezamenekisi.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/bifekizawo.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/93547552059.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/38117992143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=antutu+benchmark+android+appPDF 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_off0000ce77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE689 19564 bytes
SHA-256: 85970b428b5eb827cf586e623a6d6eb65785405777729d689520d8126a4b01c6
font_02_sfnt_off00011a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A13 10880 bytes
SHA-256: f4082ea9f90ef894049831783ec4b60ea6511276da0c30201c7c3001a802f0e6

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