Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc128cd78a02113…

MALICIOUS

PDF

72.0 KB Created: 2021-10-02 12:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a138c991fc703342bea85c6b12076140 SHA-1: 631d1057ff664ce204aad2ffea57bc651e6ad6ee SHA-256: 6dc128cd78a02113c74dba569631124f1aeb5b30672cde0f03f2731b961e00f9
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It functions as a link farm, containing numerous embedded URLs pointing to external PDF files, many of which are hosted on disposable domains. This behavior is indicative of a phishing or malware distribution scheme, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://lnimeina.it/userfiles/files/62263005117.pdf In PDF document text
    • https://sofahatinh.com/upload/files/15777480088.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/58701247324.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210923001223.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/6911389409.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/87617946566.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/20381658850.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/19510020115.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/85325101168.pdfIn PDF document text
    • http://www.heksan.com.pl/file/nivuvalikavebiwi.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/xoriwoxebigani.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/sibudoroxudufinex.pdfIn PDF document text
    • http://chipgene.com/image/files/20210923_232247.pdfIn PDF document text
    • http://saimiri.name/upload/file/sunidapadewoj.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/3690a89c294f82e2508143237926c054/nelis.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/45095787655.pdfIn PDF document text
    • http://winso.tw/userfiles/file/6177473540.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/xodanedososuroseme.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c95c192c5---12449727625.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/kuxumigomidojabixajezuzi.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/18343298521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=seems+to+have+been+meaningPDF link annotation
    • 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_off0000b2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F6 18484 bytes
SHA-256: bc292b4a24f610e4313c10459719b8ee639fb1e7208861fd59c7462b6d2a39cf
font_01_sfnt_off0000e1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F1 10688 bytes
SHA-256: 6d9e3fae96926044afde81ac17935e3d7d7b15d62a5c349d56ee42ce2cc3eb05
font_02_sfnt_off0000fa54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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