Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8ae440769d2c5d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 11:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6ff90e8bd98a249762a5ca3e89e8e3e9 SHA-1: e4b56e18eec4b6e4226353a893bede7f15d54384 SHA-256: fb8ae440769d2c5d666ed0804fad4869af2ba84d224c12c93b147a0ddc11aaf5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the nature of the embedded links indicate an attempt to trick users into downloading malware or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=tap+tap+breaking+mod+apk+unlimited+money+and+gems+android+1 PDF link annotation
    • http://sicompk.com/survey/userfiles/files/rozimezezarefifumawuf.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/begov.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/75443240479.pdfIn PDF document text
    • https://bawauang.com/contents/files/fituvuboruvudalaj.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/zenowodezowurijex.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/girubejuf.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/9629608514.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/5489263908.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/38583636249.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-8/20210908020214217008.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/65492854445.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/biwuxofuluvot.pdfIn PDF document text
    • https://onecre.com/images/content/files/diguwatavawaxe.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/59849273390.pdfIn PDF document text
    • http://sivam.pl/files/file/79845129168.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/lesiselajafimitu.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/likofakotenejewuvu.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/85474466129.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c00721a275---rusenoxulaf.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/1452316333.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/95524005645.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/444a0113198190ccd7130d4ab6c35db4/befigavo.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/wefevenawatubozipizi.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_off0000cfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB1 20560 bytes
SHA-256: 186c3e622b00a31c7dcb9cde370af883fcfaa0df219b2b6811cf130f3c2f0269
font_01_sfnt_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7E 11196 bytes
SHA-256: c1689d446356a534e9a8563a1dd7d1427c0e9ec89ccd45c3d99eb5e101b41993