Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ddf12b81c72b77…

MALICIOUS

PDF

76.2 KB Created: 2021-09-23 04:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8ca63e65711b49b65cf1ad04e0be4469 SHA-1: 72ccdc655997e634fb1915cb0156b117eb98ce81 SHA-256: 82ddf12b81c72b77c905370873cba02c2a9c222f8b804436449b401a174bc665
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document hosts numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://philabc.ru/uplcv?utm_term=product+lifecycle+management+driving+the+next+generation+of+lean+thinking+pdf PDF link annotation
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ca4fa67eb02dfd81907a6477da384153/81457142403.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/62883924016.pdfIn PDF document text
    • http://nhadeptannguyen.com/uploads/files/rakefojasutuferuxuved.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/pebutus.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/motolawalugadereruki.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/71519332718.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/zibom.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/36096439564.pdfIn PDF document text
    • https://stvorki.ru/files/file/9245475063.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/rovefulipugilawuneguf.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/89460502126.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/sujofufitufogeriku.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/vugofotididufuwu.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/59317302139.pdfIn PDF document text
    • http://i-physiology.ru/upload/85861221796.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/34754800672.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/xajavojiwifinizizivifa.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/nh6ji4rsjcv7emakjqma2pjqcu/kerisujezutewedanipekesuz.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/84349273116.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/zavibalipeboposuzobokewe.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/59457264558.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/26244529558.pdfIn PDF document text
    • http://simonide.org/userfiles/file/kinuwimakukukonajukin.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/pisosojez.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/lekedetadiduj.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/24763255593.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_off0000be40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE40 11372 bytes
SHA-256: 5b4ade6e94cf4c4527bb1e3a994fb07d1af65a6b2b31773abbf249a4c70dea31
font_01_sfnt_off0000d8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 19112 bytes
SHA-256: e378aa6d4a63146d4afa363d46c290273ae7c829891cbdb91196746b42a43dd6