Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3526556757f3a30…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 06:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 14a8ea8472bb55cd540d6008cfc8cb61 SHA-1: ae6f7803f523c6a6fb9a55cc68ad0ac6250694a6 SHA-256: a3526556757f3a3039c84f955fd99d7ab157a3e09c3f76045dfdd0720275e335
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The presence of embedded URLs and the nature of the heuristics point towards an attack pattern focused on directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=how+to+get+free+cod+cp PDF link annotation
    • http://koslita.eu/ckfinder/userfiles/files/wegubuw.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161310b24efe72---zegunitemodasadapevut.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/37823503442.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/91302541911.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/zakadizesunozelase.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/97295194979.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/romesi.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/sopozepunixoburasisal.pdfIn PDF document text
    • http://orderkai.com/uploads/files/71927375518.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/71010287161.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324bbaea41b---vuzevadabekevewatuwizuwe.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/ninegorifosines.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/7814531370.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/11977259580.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109081955057595.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/11810725461.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/xosolupaxe.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109080553156627.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/torerud.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/53518990687.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109040346307411.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/50867675953.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/gixujutawefogelorakusimul.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_off0000d7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A7 18312 bytes
SHA-256: 7ff8e42ad6b0242dc7bd8f0fdf0a32ebc011769f1e0c5e7819305c9216f31a19
font_01_sfnt_off000107ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12006 10300 bytes
SHA-256: 17493f709f77097a42d43281b52de084fc50bdeb5b476dd2d9ab14064c6fdc2f

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