Malicious PDF — malware analysis report

Static analysis result for SHA-256 140eb5c010bc2567…

MALICIOUS

PDF

70.8 KB Created: 2021-09-18 19:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c955b943381a9e0d4b5691e001059688 SHA-1: 6bb166503d7c0ce75eee865f80f9f93cd097fb19 SHA-256: 140eb5c010bc25670e4fa86b95e4a752730b3d4b3c151d57b51576dcc4279d25
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded URLs point towards it being used as a lure to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://ketchas.ru/uplcv?utm_term=nicco+ff+free+fire PDF link annotation
    • http://deleersnijder-bocaege.be/images/file/sewekoreloxedig.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/kegidemovapejesax.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/pabavejibokujabum.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/77740461757.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/95927473565.pdfIn PDF document text
    • http://santeh.md/img/files/84289736758.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/57391491969.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/55982852331.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/16636151606.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/nc48shbugcfrpbch8d7non1ira/madokagemujumolevu.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210913030932.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109090645443406.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/linumuwuloninopujubev.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/jefimowi.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/66654773969.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132db56cbc8f---gukiwo.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/72712781244.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/59916322538.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/zigosolikasiw.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/kuzaxesuketesedigisebakab.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/82258539199.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/86242285246.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/rarofedabifanazup.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/xebasirawefogetefutap.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/85708702456.pdfIn PDF document text
    • https://gulamanis.com/contents/files/rugufopifotime.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/76607438779.pdfIn PDF document text
    • 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_off0000b76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76E 9728 bytes
SHA-256: 3a83b970f08d364fe90e163cabe2ab2cdcdb0f0fffb460b4804b14d3624a82c7
font_01_sfnt_off0000ccbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 16288 bytes
SHA-256: c61a9b8cf3461d0fdfcb3fa49ba3af246e2a68966d8d9c2988b294925016ece5