Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5fe88ea2200c76…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 02:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa11bbe5eaea07eb8fd06f53537d1fe1 SHA-1: 351c4859b11cb12f63607900b2f2288a62358ebe SHA-256: bf5fe88ea2200c76e42d7f492cd292601c0089ffa16dccf682bc72a96bf6de35
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are structured with UTM parameters, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the phishing or distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://catamma.ru/uplcv?utm_term=block+inappropriate+websites+on+android PDF link annotation
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614322025b8f2---tutekinadipaludaterut.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/tezaxitiwiwaxofor.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/95045996032.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4009de35501660e5ad3e9a98d94ee823/35658804367.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/xosanamed.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/69729376869.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/6256404446.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/92145956880.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/47816677551.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/zexeluw.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/kovumebuvobobozafijukaw.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210911_1D42670ED71A1739.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/50565842066.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/24266084310.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/firusomeki.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/8227163250.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/sefuxatosupuvo.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/25967809695.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/84550001387.pdfIn PDF document text
    • http://soles2walk.com/data/file/31631181997.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/wikurimexasu.pdfIn PDF document text
    • https://webmenuplus.com/images/file/59271510135.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/54015321900.pdfIn PDF document text
    • http://sushi-belovo.ru/files/57937106251.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///zakidu.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_off0000d74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74D 10880 bytes
SHA-256: 17ac9a459a798a061d42efd54e464af810bd93204332f0f31bfcfd36ac5b60e4
font_01_sfnt_off0000f06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10881 17964 bytes
SHA-256: 4eff24b7306a9857205841487d045dadd099687641d264b80fddd92284cd0d58

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