Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7ed4c2b0871c14…

MALICIOUS

PDF

79.5 KB Created: 2021-09-12 03:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c1eba31608b24c2776a755639f10a261 SHA-1: b37f9bc27eaf71ea6283c024c4c60d29b4f3c2c5 SHA-256: 3b7ed4c2b0871c14b9cfc1fb1ad245a7b24d96258ed864c261a926af2aaf2992
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://synerhu.ru/uplcv?utm_term=download+games+ps2+untuk+android PDF link annotation
    • http://uptownchantilly.com/uploads/files/45966617721.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/winawosozegunufobubajo.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/e331784bb5f882b44c6a1eaaf5d67fe3/20803350085.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/keregunoba.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/44685453156.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/89964394177.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/62987756839.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/zifetedejewilukifikotora.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/10469793625.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/powafogoluxagazuv.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/66178705111.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cffa8cde39---19727241558.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/jogogokufatu.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/ximil.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/95703968704.pdfIn PDF document text
    • http://bjallstar.com/upload/file/wigogekeriniwukexalenixis.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/11498631950.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/gewotewagozutodapi.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/zonewalibajijixerewabove.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/fadaruzelifobeja.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/tiremusukok.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/26764111004.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/39377165371.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/julaxe.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/3758410040.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_off0000d012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD012 17632 bytes
SHA-256: 72fceaf6d51ccd0c42f050ad8be2c7205610702ca9192321678216ed85f1e01c
font_01_sfnt_off0000fe63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 11136 bytes
SHA-256: 35c7b6425e4d3e7c8c6d00df720a5e22d4107e169b7e7043abf8e93322da1e79
font_02_sfnt_off0001184c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1