Malicious PDF — malware analysis report

Static analysis result for SHA-256 3869577441ba3a99…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 22:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ddcddede84c53f6d619e047df51d7e1 SHA-1: 51fb4c04ab61a99b47fc350bebd7204b7d5ea3e4 SHA-256: 3869577441ba3a994a8e2b7d01615098dd601504ccbd555ac503982a6d778fac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs, many hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF's structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://elskup.pl/images/assets/file/62580171183.pdf
    • http://aucontecnologia.com/userfiles/files/totenomojomixefo.pdf
    • http://vipnjl.com/userfiles/files/84969567142.pdf
    • https://receptabc.hu/images_banner/files/49849776546.pdf
    • https://mysilo.com/upload/ckfinder/files/zufomomodabisunelak.pdf
    • http://fijiembajak.com/uploads/ck_uploads/files/14329873229.pdf
    • http://debnine.net/UserFiles/File/wisilenigajun.pdf
    • http://bookblog.kr/data/file/files/toreleniz.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-9-13/20210913175914824475.pdf
    • http://elisa5888.com/shopadmin/upload/files/xolodo.pdf
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/sumirejikijupuxor.pdf
    • http://www.jucadent.es/ckfinder/userfiles/files/wikadowineje.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/8120e39a8e6d9568891aa511c9510946/64675022852.pdf
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/30129978432.pdf
    • http://pampa.be/uploads/userfiles/files/90619958184.pdf
    • http://www.egymast-segito.hu/uploaded/fck/file/boteguwederorolaziwudi.pdf
    • http://mmprogetti.it/userfiles/files/vetawiroxelukizogexur.pdf
    • http://kargo-box.com/uploads/files/mipajajen.pdf
    • http://willbramephotography.com/90308401109.pdf
    • http://alrabbancapital.com/file/files/linofinesoponulogaladubuk.pdf
    • https://exam10.menapoint.com/app/webroot/upload/files/80248955571.pdf
    • http://allmedicus.com/userfiles/file/48199298646.pdf
    • http://agapetown.net/ckfinder/userfiles/files/36336445936.pdf
    • http://fitviewer.info/files/file/41897588962.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=root+authorization+kingroot
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db52.bin
34a30a028f50db31a3d0be7522e435e0565d5f90bf30b85376ec54702c5c9b8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 10340 bytes
font_01_sfnt_off0000f2a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 16792 bytes
font_02_sfnt_off00010ab6.bin
5ef366c81df96ee89dba1b72533d80aef61f9083957d1b2c83626f2521ff412a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB6 19052 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.