Malicious PDF — malware analysis report

Static analysis result for SHA-256 374346b02ec16644…

MALICIOUS

PDF

68.3 KB Created: 2021-09-18 08:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4c394c53206c7398bae10926390de074 SHA-1: f6b71b6d77c83a672df8dd8569329583e0ccd257 SHA-256: 374346b02ec166445c45636f6502536389a4f3ae36f15184b35c9c7c6757c188
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one heuristic specifically flagged it as a link farm on disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern suggests a phishing attempt or malware distribution via a link to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/zijekojazodalalawez.pdf In PDF document text
    • http://simkoongschool.com/uploads/editer/files/lanazenisag.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/sivudibugutifelavozo.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/gerikofoguzakog.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vipiluvoranadakumut.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/67274059664.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/f77b688e44852fa492a600e8a7f447e5/namowabojujodunax.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/fijuvuduvofijabome.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/35811154831.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/soteline.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/didilunajajodukuvikedasol.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/72355519305.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/48813935080.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210907175254.pdfIn PDF document text
    • http://medrea.ru/upload/files/66442102109.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/sumeregezekoxi.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/sojotejitabaxo.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70297798591.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/fusawi.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/95703195514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=partage+d+%C3%A9cran+androidPDF 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_off0000ad17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD17 15176 bytes
SHA-256: baee93243b5897ee332672b14a4926d881ce3c3d5fe41441035e7c61b9d36a01
font_01_sfnt_off0000d2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE8 10488 bytes
SHA-256: 0a740f47ec3d1db1231a818df4d4b879b5b34687e5ae070c62e0b5fa15bcbf1a