Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56328a74fb998b2…

MALICIOUS

PDF

74.2 KB Created: 2021-09-11 12:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 555668f75af04a93b83421398485b6c2 SHA-1: 081896e9471675645626104837adb68a4fd4d0c2 SHA-256: e56328a74fb998b2c8b608bb7c0043b7f5a5d06ba48e43600340f6c610cc9347
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or credential harvesting scheme. While no scripts were explicitly extracted, the presence of many external links points towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://minerva-collection.net/files/files/wavulokejuvib.pdf In PDF document text
    • https://abcoegypt.com/userfiles/files/55155324343.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161377183068c9---82538363772.pdfIn PDF document text
    • http://wamer.org/userfiles/file/vujowabobamukenizakuwav.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210903074710.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/mifege.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/vomazijilafifevezatogud.pdfIn PDF document text
    • http://markone-tools.com/upload/files/29816147887.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/nifidu.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210908235707.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/rugojakupoka.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/65474225859.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/tuwivifupoje.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/gadarasukimiganevejamili.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/soropodewemoxepaj.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/68509909015.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/xiwuwudamawojuguta.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/kagoxexifinopexivefim.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/67970339012.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/runopixitamoso.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/wulesodamegovuponemezid.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/68882221007.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/mavujedenovolotezisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=completing+the+square+explainedPDF 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_off0000bd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD14 11220 bytes
SHA-256: 55915e785199ba9e861c6c7a31e37f80fef780043173add7385c60c95872bab5
font_01_sfnt_off0000d6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB5 17280 bytes
SHA-256: 2323289e3880f76424abf0040deba646e2d63eb01c2906eaeee520e02fff7b3f