Malicious PDF — malware analysis report

Static analysis result for SHA-256 baff5dcc5375ffbc…

MALICIOUS

PDF

73.4 KB Created: 2021-09-11 17:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2a5eab091241a5d05d7640e41179afc8 SHA-1: 3d06a0a5dba87473978e922a78b49f347138cf74 SHA-256: baff5dcc5375ffbc121f94cf956c98a3837198281b57f97bb16407c7b82bddbd
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM, indicating it contains external links and is part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous URLs, including an IP literal, points towards a redirection mechanism likely used to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://stilistspb.online/public/files/uploads/files/riwipovefonupixop.pdf In PDF document text
    • http://teormech.ru/teormech/usrimg/file/26356391840.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/luzuzogo.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/fijilipopivesozajaz.pdfIn PDF document text
    • http://topflexsports.com/uploads/vatuwesogoxepomazopeti.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/tejibetisu.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/24211252504.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210911_075140.pdfPDF link annotation
    • http://kaithompson.com/userfiles/file/tesolani.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/36255413187.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/rinelubukowa.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/tasoroxemepivi.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/91321900260.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/90188825149.pdfIn PDF document text
    • https://anakmeong.com/contents/files/fenulijop.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/zukaxofukusi.pdfIn PDF document text
    • https://istanajp2.com/contents/files/22000861239.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/motekusazemewupalo.pdfIn PDF document text
    • https://funbugs.ie/files/file/waporolosunow.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/61252610074.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60056800558.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/tekanuwagujerivesafamo.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/negobomewuxudilafesawo.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/lizitabot.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/47449465303.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/18904256556.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/roxokam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=usa+truck+simulator+pro+mod+apkPDF link annotation
    • 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_off0000bf08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF08 15868 bytes
SHA-256: 857737e48b9d6e91192c8f96908cd217507fff9d07ec3c978c6c84da23c581e7
font_01_sfnt_off0000e738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE738 10640 bytes
SHA-256: 3948209bf5b2c83212b01e7fe3e4e36143c44f8dd6f0cc5e1ae8b3ccc758f38a
font_02_sfnt_off0000ff97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1