Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a070522a9bee8a6…

MALICIOUS

PDF

68.5 KB Created: 2021-09-28 16:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a787a8c795b8dbc60a0b430acf44cff SHA-1: a2c97d49aa036e932f0e6b57ebf0c73614b5cae0 SHA-256: 9a070522a9bee8a683a1ce2fe62b0605e61b8271f4479393141133eca84e5040
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were extracted, the embedded URLs point to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee033392ed---90874262715.pdf In PDF document text
    • https://otterdisplay.com/userfiles/file/43907907476.pdfIn PDF document text
    • https://lorus.rs/files/70831119338.pdfIn PDF document text
    • http://naso10.com/userData/board/file/fapapisubumeg.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/dopetuwazafizibimodij.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/xokezufovexaj.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/80687410839.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/nitezeki.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/pazawubivuwamiputo.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/ab6d381529dc1e4c942e37e4631ed749/welelugokagumezowu.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/24601756306.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/falisewenuvumokijiti.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/kolasaladipidasufepom.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/roturokimeluzu.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/94813018238.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/8943425620.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/jirowoxiletegomaxodunev.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/wisamesugowo.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/fawapimelilorer.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/83326124028.pdfIn PDF document text
    • https://beaszemin.com/files/88086642282.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/wubikuzepumetilaxij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=app+sip+androidPDF 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_off0000aec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC8 15540 bytes
SHA-256: b63055747bbacee6820a9e6e1db8fc34ed7a35e75b7bf1b646b861f8dcf30a02
font_01_sfnt_off0000d5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D7 10088 bytes
SHA-256: 11fac286f6c7360d3c576c5d8ca3c0eea7ae12b6df41be0732854313e338e672
font_02_sfnt_off0000ec62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1