Malicious PDF — malware analysis report

Static analysis result for SHA-256 4168b3dd8ba3c51a…

MALICIOUS

PDF

69.4 KB Created: 2021-09-18 04:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d9d26c0a20ea3d54a2c15e84f079f59e SHA-1: 6345c9728f159797f7169705a446348d50012706 SHA-256: 4168b3dd8ba3c51a4dc57828579296f26f1b9efa6ee71f2673547cdea5e1c622
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous external URIs, including one that appears to be a redirector with UTM parameters, suggesting an attempt to lure users to potentially malicious websites. The PDF structure and embedded links indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://krisoc.ru/uplcv?utm_term=good+games+for+windows+7 PDF link annotation
    • http://ledins.lv/cms/file/77709275080.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/worojujuze.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/xuzemivexupusozusilidodov.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/34071780036.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/17933852761.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/vodugu.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/79292154209.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210911210109.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/41722525162.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/pejunotida.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/pubatavobejijoposaba.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/88161802678.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/42619048687.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/75147171475.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/44848379440.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/zixufegawanuduwujix.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/5519501456.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/budebutezulipugifigosizeg.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/17736108993.pdfIn PDF document text
    • http://inistor.com/ufiles/files/27190855811.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/30593594291.pdfIn PDF document text
    • https://geloracinta.com/contents/files/71804952340.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/ririturawizoberowaveza.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/29519596566.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/xinetepov.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161403d8342ee4---molibekenurug.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_off0000b1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA03 14936 bytes
SHA-256: 6494cfdde16d261e18c84224a8e9506e69e4c09a49fe2e3c8522b6d22ea28ab2
font_02_sfnt_off0000ef8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8A 10728 bytes
SHA-256: 2d5117aea4bcc198c87ea99777497911c066fe9375059a272a28308f81c0c7e8