Malicious PDF — malware analysis report

Static analysis result for SHA-256 69643254f5ee783a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 02:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 343ce91ba69c0b4e16dc27e40bdee4a9 SHA-1: 1bea32f6fdce65f77613a70ca014daf14815d599 SHA-256: 69643254f5ee783aec3714e0a69a6204e82017d7dab50d8c960b4a42e58e0aaa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect the user to malicious content, likely for phishing or further malware delivery.

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://eastcity.hu/ufiles/file/43439372821.pdf In PDF document text
    • http://sibmaxi.ru/userfiles/file/xaxojigukibarus.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/53734632526.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/dipevuronapukefonotis.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210914015842_y4yi6g.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/66988181417.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/xadog.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/kusuvadagikuvugedujikoxu.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/59688564426.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109091430245898.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1631615889.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/vofazigepofasetuful.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/71906370262.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/7247391082.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/7134505886138b98457b0e.pdfIn PDF document text
    • http://peoplefoster.com/pliki/50599116525.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/likogevasisiwapuwam.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/majikenebijoribudetojit.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/48235512203.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/kukazobutepatesadan.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/marunamov.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/29544512595.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/72271188966.pdfIn PDF document text
    • https://beautydent.hu/editor_up/fiwurakorowipi.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/wupomasa.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614086bdd4417---poxosibavekijavenawidufog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=flat+zombie+defense+mod+apkPDF 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_off0000cf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF82 10828 bytes
SHA-256: 928ba256304cd25bc3756de21515578c4f2ad3a36b9152946ef4a5b4dcfc044e
font_01_sfnt_off0000e84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 19848 bytes
SHA-256: b4213027cb3a9b569bca6436db4d9c0b53e7e8fba15f6af106d24fee89657545
font_02_sfnt_off00011c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1