Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18a0522bc880d7b…

MALICIOUS

PDF

75.2 KB Created: 2021-09-20 00:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e7473416f1c19941e2c9837afa765da0 SHA-1: 752384784fd3369fa86835dd3f291ba467b50c63 SHA-256: d18a0522bc880d7bdd7d85ac708f092761b9dd405eb33b0c2d6276545283b8bc
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to link farms or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' firing further support this. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=pride+and+prejudice+and+zombies+full+movie+123movies PDF link annotation
    • http://bulk-supplies.com/userfiles/files/fevosogusaxisudakejoduz.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/72804358191.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/zijobasa.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/35677500462.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/53355908811.pdfIn PDF document text
    • https://sjaindonesia.com/sitefiles/file/lubusav.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/57491665990.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/99831433213.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/sofodoguziturazoxewuviweg.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c166810621---fekizikopowetefekovutepok.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/nuxugefinawejilixapi.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/pamazetirakot.pdfIn PDF document text
    • http://boardmark.com/files/file/janunupan.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/24347088341.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/39458939667.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38457616153.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/95803992967.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/fevutugurevazi.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/gonixironin.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/54991880129.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/pezozobiluxi.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/66247867030.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7ad0a1947---bivapijegusuwipu.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_off0000bdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBD 11524 bytes
SHA-256: 1c434774aec2170af0e0a2340c1347f08e247378815332a0f5e835962de07a2f
font_01_sfnt_off0000d8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DB 17700 bytes
SHA-256: fb7af1adb02f847834c9d892faae88496de72b564415b8a75ea55cfcdb40ccb5
font_02_sfnt_off00010692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10692 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1