Malicious PDF — malware analysis report

Static analysis result for SHA-256 99768ea822f71620…

MALICIOUS

PDF

85.0 KB Created: 2021-09-24 03:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d61b71869005163bb46d9effe966d235 SHA-1: 1e2627cc3b007e7854bcd88ebc57ec6486d84a59 SHA-256: 99768ea822f716207a9d61bcff2db7eb7b3d28467f0872b35a2224191b4e5b48
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external domains, characteristic of a link farm used to distribute malicious content or phish users. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://coretry.ru/uplcv?utm_term=best+sms+organizer+app+for+android PDF link annotation
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/90658270868.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210906_5C155389D5BDCF01.pdfIn PDF document text
    • https://atarentacarburdur.com/userfiles/file/18556776550.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/gonotofemuguwemir.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/mitoj.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/45375592561.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631603980.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/16108676823.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/rutokifukodiko.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/pozomolegojarifadusuma.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/19236997090.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/96970632629.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210924_518EE6186548D642.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/58542158366.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/sabibonafonebuwojilibumed.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/69973509562.pdfIn PDF document text
    • http://sivam.pl/files/file/jufukezisiro.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/nexupijusapina.pdfIn PDF document text
    • http://hiniceshine.com/upload/juledujex.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/80832986242.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/37829866136.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/gomufomiwamepe.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_off0000e673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 18056 bytes
SHA-256: 010ab80c89b9d2f81fb225132c79c52ac118ba9b4ffcc9fa460822b1dbca5173
font_01_sfnt_off00011553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11553 10908 bytes
SHA-256: 29ef1cf75144987e50d5d8b9cd1808851bc6abe5b75a63f6abe026ccd86b9df6
font_02_sfnt_off00012e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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