Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10f2f2f06093ea2…

MALICIOUS

PDF

76.2 KB Created: 2021-09-13 03:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a45ea5dcdc8a6c803d1fb644a5c2e622 SHA-1: fe12383d9691ad8099f81ab57b9c1bd49ec6c627 SHA-256: c10f2f2f06093ea2141ba2f8b540bae1bf979844e50da97217c86112cc6fb758
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pixomot.ru/uplcv?utm_term=omegle+unmonitored+section+link PDF link annotation
    • http://canshu.dlzj.net/upload/files/20210905082802234565.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/bujurasu.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/napisodogizenakufolep.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/nivanejifef.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/2712176833.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/11af554844e285b1f5499ec8da85ff9d/17003530166.pdfIn PDF document text
    • http://schokofontaenen.de/idata/gogalobajot.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/30326983052.pdfIn PDF document text
    • http://topp.pl/_topp/file/59889667249.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/xisedoliwosatumekikajame.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/59374500461.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/899300972613e7ae1244cb.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/wazijel.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/diwilaripifemubexagedi.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/37704926714.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/10016528951.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/pekikoreduzejexogulojerow.pdfIn PDF document text
    • http://deauville.ru/files/file/xodasozukufurepa.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/pugagifajakem.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/8288f17771ff32808d4dbb87a0a57c08/17341273268.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210912092334_wtjz42.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/maresekumupamigefasasow.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wasaderew.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/4612395196137ed582fc8f.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_off0000c65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65A 10768 bytes
SHA-256: 545f6f5860c90627734389561d3d2aff4b6154be715c06545f260566b3acbc07
font_01_sfnt_off0000deeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 17320 bytes
SHA-256: 22db613d3bb164f7cd305024a4a1f03c7baf9fb7f158627308623ca0ab7954e8