Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3311a434585e53…

MALICIOUS

PDF

84.9 KB Created: 2021-09-16 17:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d0b552b6549db44f4b423544ee2f8a0 SHA-1: f22e6410f1bf9f0c402fbdf483d23f3ee19b5efa SHA-256: 3e3311a434585e533376637628df125f09d33dbf29e7d61e2630801e78e5c941
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links pointing to external PDF files hosted on various domains, many of which appear to be link farms on disposable hosting. This suggests a phishing or malware distribution campaign where the user is enticed to click through to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://psycare-spb.com/userfiles/file/lupolenobine.pdf In PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/25035002602.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/xixexinobolulapevep.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/desofiginuwiteta.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/83935373908.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210902154345_2107231462.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/2438940561.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/kulatiwexexivanelupif.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/56087278068.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/wozositigokanu.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/72694679213.pdfIn PDF document text
    • http://hopkim.vn/upload/files/duditemofima.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/92389419524.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/lamubefefisofer.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210914203136.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/maminubaxawirisilamukop.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/17962049263.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/lazigawawikedazalo.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/tedoxa.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/38627607249.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/fagifopiwaxepojodemi.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/kerulatuduz.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/voporewibabemunawaru.pdfIn PDF document text
    • http://goref.ru/files/file/wegikavagutixifupimujiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=language+difficulty+rankingPDF link annotation
    • http://elezioni2014.gds.it/userfiles/file/zogus.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_off0000df65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF65 20324 bytes
SHA-256: 0af2adcc2568636dc45775c4a62825b823a7f91c2d28b555540dd339139c967d
font_01_sfnt_off0001155c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D73 10624 bytes
SHA-256: 2438fd9ea4cd229755afbe4ba8c937bf784d05606673e6a950c03f9cb754ccf1