Malicious PDF — malware analysis report

Static analysis result for SHA-256 3205ed6d0c3c1f1e…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 13:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 87fc19381e1ea34d5cc6d0a213e50067 SHA-1: 7dee59590e4d94c61662a7d734256c590170e27e SHA-256: 3205ed6d0c3c1f1eff2017c83a81564069745cb2633fa56d72d27e53c4a6fb84
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable hosting and using UTM parameters, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

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://medvor.ru/uplcv?utm_term=i+consider+myself+synonym PDF link annotation
    • https://doanhnghiepvietnam.org/img_duhoc/files/wetebume.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/34852338235.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/05/file/20210905_185857_111.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/75182765282.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/namawutalovemamaj.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/35090485085.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/82763576242.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/zofozemeke.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/vaxekeseguke.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210901134619.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/giwuwepixozubir.pdfIn PDF document text
    • https://o-dance.com/upload/files/17426539727.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/zujarabejitagiz.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/8411055105.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613522d2ecf1e---37091928459.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/78090691247.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/69257566522.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-14/20210914013408842075.pdfIn PDF document text
    • http://mauthietkedep.info/upload/files/82078403902.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/52196158224.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/kifowil.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/xogoxugomoboduki.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/kigajilebotimib.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_off0000d818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD818 10440 bytes
SHA-256: fa7f2a61109e1d24afc40b3320019e584b52245595f1163baa0582d69ae40b3a
font_01_sfnt_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 18612 bytes
SHA-256: 1c357edf1b2424609b3543571f86ff3ada5d257dd24ed72602f0b7852c2d065b
font_02_sfnt_off00011f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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