Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b41c02962ab4449…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 01:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 388d4819def89685040cff0747e09d4f SHA-1: a527c6d0b153b4896649514c4b64f28b24ff4ec0 SHA-256: 9b41c02962ab44494b419a8a4b6f0fcc0f84af22ea01182ce65a6b320f984806
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document uses a browser installation lure and a download button, common social engineering tactics to trick users into executing malicious content. Numerous external URLs were extracted, suggesting the document acts as a gateway to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=android+apps+for+blackberry+q10 PDF link annotation
    • http://avtosfera28.ru/userfiles/file/gizibisilolasubobiduso.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/zepidewepoweviwukerivum.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/jujewilefopividusiroma.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f09b154aab---jinobamazes.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/cbde3b9c4d2331aa4fd809d88f41645b/rugivefefagul.pdfIn PDF document text
    • http://ewtch.com/upload/files/55398945417.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/9976213428.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/gilujozivavolezotosutiva.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/gifawunewilisaludo.pdfIn PDF document text
    • https://wita.lt/images/files/26773786453.pdfIn PDF document text
    • https://amgaa.org/temp/files/22444606874.pdfIn PDF document text
    • http://khonggiansangtao.com/platformecom/img/upload/file/xowezisasoxopag.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/83228940253.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/11137948965.pdfIn PDF document text
    • http://spharma.ua/files/file/18644408390.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/mirigikemofe.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/delazufelefadonug.pdfIn PDF document text
    • http://cpviettin.com/upload/files/92024345921.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/16513849649.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/waferurolurogodilok.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/nelelez.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/riwuxuba.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/jefinuzotelijisexuwu.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/93208761652.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/44427735190.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/71501450599.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_off0000da61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF273 17416 bytes
SHA-256: 800d3204b8ddd860cbc9f2357f74466ac88fe32547504f76f6c12d218f5b175c
font_02_sfnt_off00011f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9C 11160 bytes
SHA-256: 25185b5ae97f894e9a321d9389397e930cd72f6d99d614e6dc46e3bacb0bc3e3