Malicious PDF — malware analysis report

Static analysis result for SHA-256 2493bdc29e16ce31…

MALICIOUS

PDF

72.3 KB Created: 2021-10-04 04:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 516716b94f17d5645145551ab3dd4451 SHA-1: 8b67ca46c225968700e43e2ba39af2d30af1ec68 SHA-256: 2493bdc29e16ce31b332abdc4438224512535c5f63de9dfeed56eefa4c920dc8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While 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 0.9975

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://crysiq.ru/uplcv?utm_term=live+cricket+tv+hd+app+download+for+pc PDF link annotation
    • https://www.ftha.org/admin/ckfinder/userfiles/files/19692995919.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/84701684077.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/wenofudakuzikor.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/d68d3aa321aad8bdcb09cd057c5517de/68931167953.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/41417a9bd15bb5690ed9c65c2289daaa/99285593652.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210927_e2d9a.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/zinilokivevopojuwodu.pdfIn PDF document text
    • https://menu2uplus.com/images/file/97354136748.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/fovapaluniru.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/37980306115.pdfIn PDF document text
    • http://henca.com/files/details/file/55399095790.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/tuzepozurilalax.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/mibopuxinumupunugaxisani.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/40267332060.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210909_35A690724C347F39.pdfIn PDF document text
    • http://artospace.com/pics/file/43900276146.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/47814869857.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/doruk.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/ferowamasa.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/vovasasovirinelaru.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/68092000606.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/kudujelojinolomevujupeweg.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/34253965773.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/56619809011.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/11036524352.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_off0000b5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DC 16768 bytes
SHA-256: 615b9b8e2ef94844d6ff0eb8f06958d3f6f7ea59d1eb9dd4f2f62140ecaf8e98
font_01_sfnt_off0000e0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 10748 bytes
SHA-256: 067167ee05ddb1c0d76bf3602eec83bd23576977b04aef11a55e8f49cc794133

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