Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c960f3df8399fc…

MALICIOUS

PDF

90.6 KB Created: 2021-09-19 09:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 67e7a5592818cca1ad940608e1e99be6 SHA-1: 67bcec9aa889740e19e0c1f81279474d09aa03ad SHA-256: a3c960f3df8399fc8620c999973998f94800ac88ce23d68da9fb918c08280908
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to obfuscate the true destination or distribute phishing content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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=schaum+series+electromagnetics+solution+pdf PDF link annotation
    • https://justbuymeds.net/userfiles/file/zefidebi.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/zuginugalomulemix.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/64644357629.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/39114956198.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/74037026954.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/jemobo.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/betixuxib.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/96918149399.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/wekavevowufefamexavaz.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/27383014002.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/sifuweboxomip.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/96130331308.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/60570977790.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/wekategopezifewamidoni.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/29126273377.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/67b6ec9d4fb1ac9dba356084fd6ef911/50593270071.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/93787893513.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/rakivobixowujog.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/89722090310.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/ginavarerufa.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/bezejilol.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/revijibigosumetinanijefu.pdfIn PDF document text
    • https://eclearusa.com/images/file/bipifawaruwuzopunobamuvo.pdfIn PDF document text
    • http://parfumland.sk/upl/dapoliwoxijaz.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_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11054 11244 bytes
SHA-256: d8ed9c4ec566d4028d9168d7a56fb732b5c7da069e9e31981a54909615fe8747
font_02_sfnt_off00012a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A42 18888 bytes
SHA-256: 509ae0f8a22f7fa7f5d4cc236978bfb5986e48e5cd129bc35c7d801b92cba7e9