Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b9b7a68af061a2…

MALICIOUS

PDF

74.0 KB Created: 2021-10-12 23:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0f5110fa269ba8715ea8c50ba33da9da SHA-1: a0cb2ce83182df43771df1c906157c9ddb8994be SHA-256: 75b9b7a68af061a2947be07f988ab033c24d2dfdd21b2b26d821123bd07bdf53
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous external URLs were extracted, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the PDF structure and the nature of the URLs strongly imply an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://vietucmould.com/img-vietuc/files/57988660605.pdf In PDF document text
    • http://yugreat.com/filespath/files/20210923152321.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/80784165434.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/27626755368.pdfIn PDF document text
    • https://22importexport.com/eimages/file/16451019562.pdfIn PDF document text
    • https://anesaportugal.org/upload/file/33750677114.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/timirajegatebo.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/moxofa.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/feritikurafasi.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/19190284625.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/14743362934.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/34129402041.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/movowagavewikuridazepamu.pdfIn PDF document text
    • https://guitarenko.fr/img/files/51377376738.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/65651810986.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/dujarode.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16147759279737---rilopomipiloduronefum.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/96164368231.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109031610187310.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/63187230198.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/guzap.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/35095257222.pdfIn PDF document text
    • http://seed-hongkong.com/uploads/file/57936399855.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/78294015933.pdfIn PDF document text
    • http://4rrecycle.com/files/file/30364621794.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/ec502b466d6e77af94d2847f6b59afd1/sabuf.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/vItLtdF7Pec/uplcv?utm_term=2000+dollars+in+poundsPDF 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_off0000bfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB2 10400 bytes
SHA-256: 95d0e20f99da4f5702a7541f18c61206153b0c678db5e464aac8895b82ae7006
font_01_sfnt_off0000d73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73D 16760 bytes
SHA-256: c3dd28cf6ae232e35cac0e43fead81be147e439545f48e1080b7894c7cdd068e
font_02_sfnt_off00010217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1