Malicious PDF — malware analysis report

Static analysis result for SHA-256 4727a0faedb74cc4…

MALICIOUS

PDF

95.1 KB Created: 2021-09-10 23:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c89fbbf726257ef8a646a6a791076dc8 SHA-1: 22f385094632414655df210d6da23aa7fe135aff SHA-256: 4727a0faedb74cc4f2b6b9102db2bdf9cd933b4d49c6c7eaad1a81aa6cad9301
126 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, containing numerous links to potentially malicious or phishing websites. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131d1fc1e073---17572056169.pdf In PDF document text
    • https://questyme.com/userfiles/file/95280657622.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/4289130704.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/26031311795.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397f376069a---47841852764.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210905_A6426AECBF09CA69.pdfIn PDF document text
    • http://zgic.ru/!upload/files/29234610199.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/13001184047.pdfIn PDF document text
    • http://seamacros.com/upload/file/podijebaf.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/luledamudizedivunapawe.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/57930277882.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/4183091592.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/46990500661.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/18743734901.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/15093399128.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/xuzetizemow.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/74559881559.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/jumikasi.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/nipukeronubitusaw.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/xeduv.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/21382992809.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/1503340399.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/9916488022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=android+best+editing+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001515b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1515B 18124 bytes
SHA-256: fa0a80d764bbc33d471ea9cae1bfa978ecb436af66e96ca322553129d00c0448
font_00_sfnt_off0000f3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 10640 bytes
SHA-256: 455b19234438ae48e38fc4d791c50d715cf32b04b9673a941e47580eb8b64c3e
font_02_sfnt_off0001241a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241A 17568 bytes
SHA-256: e7d5d9284ab5ff62bc018fce9b2034648817c86405396982d4411eba9ad6647b