Malicious PDF — malware analysis report

Static analysis result for SHA-256 392d52c8da5e0701…

MALICIOUS

PDF

76.4 KB Created: 2021-09-13 12:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b01232d0c485be510a6b1415e8d6fbe SHA-1: 5fcebd0425ba7883033e4f904afb22cd598241a0 SHA-256: 392d52c8da5e070107f985603cb6c0e7d37dd5336a0e79515eed11f39bbff648
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The sample also includes numerous external URLs, many of which are linked to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=free+scale+on+my+phone PDF link annotation
    • http://chukysovin.com/img-svc/files/vejotiwojeke.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/32667988563.pdfIn PDF document text
    • https://cristalensi.com/public/File/maturo.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/41962395042.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f08b09d542---rumetisitadekebitojo.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/fofukobedifovijebewov.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/9546687904.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/3979879031.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/lonuzipotiretim.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/66175985617.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/87531236165.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/kinolilej.pdfIn PDF document text
    • http://sofar-france.com/userfiles/file/xiridavow.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/11777874681.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/47916326611.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/pewazifalugowabovizadez.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/wifajimajefatazexetega.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/deredazamodagag.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36358600605.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad9cd3de34---bidejalugiweforiwe.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/25736779330.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_off0000c5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F2 17848 bytes
SHA-256: ed77ea2b2565ec0f0470328a3b6c21e14b43176f3f8a5895e462178881fefb7d
font_01_sfnt_off0000f42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42D 10540 bytes
SHA-256: c630e9ed4dd0e9ceae6e71b9144b3ccea4599ce49d6c0f068bf4e8c8885c53cb
font_02_sfnt_off00010c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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