Malicious PDF — malware analysis report

Static analysis result for SHA-256 df89eb210bcc7366…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 01:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aaa5d13ba1b6ffd513234b0bbba3828e SHA-1: 18faa3873670abd83451ea48ec9f5d0004d8b433 SHA-256: df89eb210bcc73660f5bca6cc14d4eadbbd4f7cadb06ca409cf538bf50bea5fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's purpose is to direct users to a network of disposable domains, likely for SEO poisoning or to host further malicious content. The embedded URLs reinforce this, with one pointing to a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://yugang360.com/upload_fck/file/2021-9-1/20210901104626353719.pdf
    • https://iieng.org/editor/ckfinder/userfiles/files/nudow.pdf
    • https://shidoremicrosys.com/media/visosabokonezusekix.pdf
    • https://hoanghaie.com/Images_upload/files/27309023115.pdf
    • http://exito-opakowania.pl/userfiles/file/govomogisubewilijupuju.pdf
    • http://al-bandak.com/userfiles/file/58120005510.pdf
    • http://sung1.com/upload/files/tiwasukimenekoda.pdf
    • https://franchiseharbor.com/files/files/tikisasu.pdf
    • http://voyagevietnamlaos.com/hinhanh/file/wozoxawilinejipodigebew.pdf
    • http://monikaknoblochova.com/userfiles/file/nejatipebute.pdf
    • https://themalc.org/files/file/10086659645.pdf
    • http://ikra-ekb.ru/files/fckeditor/file/25315155982.pdf
    • http://crosswaysrecruitment.com/userfiles/file/58616889947.pdf
    • https://arte-salon.ru/upload_picture/suxosagirokanisutut.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/2euu48q3vnd7m7bmneb50cmivs/55829967455.pdf
    • http://4bzsoftware.com/Images_upload/files/nadiluvotuzukumigesef.pdf
    • https://sopkambing.com/contents/files/11485849310.pdf
    • http://birnagarcollege.in/userfiles/file/dadevepozibo.pdf
    • http://kzlo.pl/fotki/fotki/file/xelum.pdf
    • http://longthinhphat.net/uploads/files/35386604856.pdf
    • http://twfbs.com/ckfinder/userfiles/files/jasilidetataxodiz.pdf
    • http://esrafisek.com/images_upload/files/duwisifumek.pdf
    • http://suliaok.com/v15/Upload/file/202193354311090.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=search+exchange+contacts+android
    • 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_off0000d5c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C4 16792 bytes
font_01_sfnt_off0000eddb.bin
5628613011151c8f7c4c64832685bfa75419f834d35859461a070df6921d0f58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 10780 bytes
font_02_sfnt_off00010672.bin
ece06ce43536cf37db125c4d75b9341a2a0487de4bb63b3355e805097f7a8b8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10672 17260 bytes

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