Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a2ae90d729a250…

MALICIOUS

PDF

98.8 KB Created: 2021-09-20 00:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 961b5d67abd8fa869c59e1abbf2f5e11 SHA-1: efde759ae4ced108132dd43e901bc6f08c96257e SHA-256: b4a2ae90d729a25043e0ec7d6582c11395dfae779c39b01731ee0d0938491923
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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.
  • 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://onfireinteriors.com/userfiles/malomato.pdf
    • http://domosplast.hu/files/file/vawijidareki.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/nasevifinovewopug.pdf
    • http://bacsionline.net/userfiles/file/vidofoletawib.pdf
    • http://cortocircuito.trialpanel.com/images/Upload/files/megexolutamoruduli.pdf
    • http://interface-referencement.com/userfiles/file/28938220360.pdf
    • http://dreamscar.eu/userfiles/file/bonilinaveresobivovopiw.pdf
    • http://tindangnhadat.vn/upload/files/65883021570.pdf
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/36679928183.pdf
    • http://belst.by/upload/file/30374770765.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161435e69a3d94---kejukomizenexobiravarurel.pdf
    • https://clubkdo.fr/img/pics/files/38700056466.pdf
    • http://irvinenott.co.uk/ckfinder/userfiles/files/12546760433.pdf
    • http://zavalinka.by/var/upload/file/dakaluludujebebir.pdf
    • https://dildendilecevirievi.com/upload/ckfinder/files/pajavopowewut.pdf
    • http://cansuyu.org/resimler/files/woworerugad.pdf
    • http://barrospizzadb.com/uploads/files/pavalofuzojemokazu.pdf
    • https://patriciogaete.com/upload/file/39045731678.pdf
    • http://ffarchitettura.it/userfiles/files/xurudesufafedaki.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/97734449795.pdf
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/82149914792.pdf
    • https://arte-salon.ru/upload_picture/13907162022.pdf
    • http://bachtungcompany.com/upload/files/xomoxisapadila.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=high+elves+8th+edition+pdf
    • 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_off00011dbd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBD 16792 bytes
font_01_sfnt_off000135cf.bin
caac0c51315b13722f95f4301e919c1c87d56c1a6575e14780ce727d56d00d7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135CF 18216 bytes
font_02_sfnt_off000164d2.bin
ce87b3a5a397765c8e469ee113e87e8e5d740c05a6067a9a7b6baa0d0a45d2ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x164D2 10780 bytes

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