Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9c49eaba5d69f6…

MALICIOUS

PDF

71.8 KB Created: 2021-10-04 09:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 151a77fde0da56d91a33ddf98aa2671e SHA-1: 223de8ffec43c553fd3326ffe2990c975d7ab537 SHA-256: ae9c49eaba5d69f617d0d3e6823d394041f312995115b41db1b1ef1a4e97c752
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan' and by an ML classifier as malicious. It contains embedded JavaScript, which is often used to exploit vulnerabilities or download secondary payloads. The presence of numerous external URIs, many pointing to PDF files on various domains, suggests a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nasikampung.info/contents/files/bivimofatilojomipixo.pdf In PDF document text
    • https://thietbidiensino.vn/media/ftp/file/manepenat.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/pominaworokabudonolaxeg.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/38485670608.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/kilunugebolul.pdfIn PDF document text
    • http://rubensova16.cz/files/file/patofekuwakijixezabiju.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/kirevowopaxobotajokisatun.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/71125049704.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/52434482505.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/xifukewafunibusa.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/57363897603.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/614e717537a8b.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313f309da1a---39473700257.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/5715112662.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/78945431032.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/60779533690.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/wevizi.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/wikamevubokubozug.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/sirozuparotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+you+convert+a+word+document+to+a+pdfPDF 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_off0000b001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB001 10832 bytes
SHA-256: 4194c542c12d25df99a4de46398360c8203b93890d584e6354e18d3e2c57955e
font_01_sfnt_off0000c90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11F 18436 bytes
SHA-256: ae66ce243954c8c3d5478c5162651aafd9eff586572c17c1f6d0ecc68c06f1cd

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