Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc73ccedb148af95…

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 02:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1f608f21cdc2194a3f477dd25cce70f8 SHA-1: a54b426b5756f4c46b5970acf9c1b58d5e9e7db1 SHA-256: fc73ccedb148af95bd502d81cfc56d88a62ef5e80c43de24891616a5259bf8eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, despite some being marked benign, point to a pattern of directing users to potentially harmful external sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM suggests an attempt to obscure the true malicious destination through numerous redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lionsmarsala.it/userfiles/files/39185751377.pdf In PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///57498846250.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/rozujukolazu.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/42322130589.pdfIn PDF document text
    • https://netpage.info/userfiles/file/17994428164.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/75112123654.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/doxomikosepirufulavuteki.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/rigegepozevuzefijigenuw.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/sarigeliluxunegefuxaxesa.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/73996149880.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/12976615813.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/78414499309.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/89901699803.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/72035825801.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/lewupunew.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148c7cd660a2---sadunudikoralibe.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/vovix.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/91788993905.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/xuvonidusemobeg.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/dozedivu.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/gopopowijeluwixinidof.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/97514954113.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/dilog.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/pezuz.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/31434378323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+pros+and+cons+vs+iphonePDF 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_off0000b312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB312 16172 bytes
SHA-256: d6e442cdddac746a374b986ddc4e2a912569f77abc8a0ef0875a1756174d86e0
font_01_sfnt_off0000dbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 10512 bytes
SHA-256: 9ee12425f47efcb200dac2b460262fe4130fdf3f615bae7a398110f43bd2ee4b