Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ead56b87ab9906…

MALICIOUS

PDF

82.1 KB Created: 2021-09-10 23:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e8ab54d1791f5b77cb9c9bade2d40a10 SHA-1: 6f7f8d835d1a5c24b1bd87e602712e062ed79718 SHA-256: 33ead56b87ab990609698c8b874aebe263b0784a4bef085dc216329daeed5357
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a lure to redirect users to potentially harmful websites. The PDF structure and embedded URIs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drafthe.ru/uplcv?utm_term=reading+comprehension+exercises+intermediate+with+answer+key PDF link annotation
    • http://emailreceptionist.net/userfiles/file/nisovavonam.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/56748943992.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/16929571871.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/denolufeweratulurid.pdfIn PDF document text
    • http://teplospectr.ru/images/files/75199036752.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/33238751455.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/piruxozitipuna.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43005119280.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134e103bec70---8700953188.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/14362126750.pdfIn PDF document text
    • http://finliz.lt/i/File/84191387408.pdfIn PDF document text
    • http://www.siposferenc.hu/html/28331105276.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210909212525.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/lakusawotu.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/gasawimepuro.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/dinopotujosudoges.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/78823063292.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/sukesasem.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/vixenifabopax.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/97629663700.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/jifarivupopor.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/88566152057.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_off0000dbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDB 11352 bytes
SHA-256: bfd5120c60e10948574455d61bc33b4ab83e1e439dd330be8b8c7add2d874579
font_01_sfnt_off0000f63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63B 16776 bytes
SHA-256: 7cebe44f980e55d1f833d964b3b2153a8687c0ed71a4bcdd0099209678457916
font_02_sfnt_off000121ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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