Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce25da528bb728db…

MALICIOUS

PDF

89.3 KB Created: 2021-09-12 20:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: cc9a4627df0027320118751497a989f9 SHA-1: 6ba6ecba3723f61486b91882da29d73f93159962 SHA-256: ce25da528bb728db550d52484dc53be4b41ec3cda0ee464b425189a1e59daa9e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs and a heuristic firing for a 'download button' lure, suggesting it's designed to trick users into downloading further malware. The PDF structure and embedded links point towards a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=8.1+product+key PDF link annotation
    • https://medgal.pl/admin/ckfinder/userfiles/files/wemikevefexifut.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/nosabagilamure.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/mipugovoxitikoti.pdfIn PDF document text
    • http://master-br.ru/img/file/48837070057.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/84289448451.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/85746478785.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/91141484413.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/8230500838.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/nudijesapedelipujatitajum.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/56120316330.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/48139167969.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/sipad.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/devejakevilefepipofakuni.pdfIn PDF document text
    • https://mangallagn.com/images/file/liganiwufufupedor.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/42798445743.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/163146513015625314012.pdfIn PDF document text
    • http://rcot.org/userfiles/file/guwukedujilunapaj.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/zatolamidegawumi.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109050706173132.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/pesilikorufenurojumi.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/makaresugerabokogunede.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/lurirejefovolenuzogusore.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/dodokamovekopisigigemisem.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_off0000f655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6C 10468 bytes
SHA-256: 625cc19531e9f8265b3a528cd2852d95b31e8337a96b9cd94ff66928259161bf
font_02_sfnt_off0001266b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266B 19072 bytes
SHA-256: 68fa23da6be50cbc20b93a0b7258d8f5c819e3b66c390002b78b7bb9306e012b

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