Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b090081ba30eb1…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 09:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 558053298a208eb880cd24c187b3caa9 SHA-1: 017ad3689a7685e47e66721fe64975cb0c4b6f1b SHA-256: 80b090081ba30eb154a185b7b6a6cf328fc50237ffa6f0c7ed902c804e02ba29
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://inwebjor.ru/uplcv?utm_term=phonetic+alphabet+pdf PDF link annotation
    • https://kar360.com/resimler/files/57663200510.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/49127592973.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/fufitozegixurusorafanixa.pdfIn PDF document text
    • http://newmob.it/userfiles/files/46947444828.pdfIn PDF document text
    • http://electric-kernbichler.at/51276696453.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/3247522436.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/vezemirewoliloredifalagid.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/87396642890.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/fosituxogidufuvezolukod.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/ronefuv.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/wegivupavuxozosinid.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/2901590ffb954d5b49982a3ef2f1fc62/9517118920.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/a9396d0924b3bef4ae8e89038c5db1ac/58188184563.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/ludima.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/8075797832.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/82474743860.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/pukowi.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/18185102896.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021091415232630.pdfIn PDF document text
    • https://grouptm2.com/contents/files/90938832707.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/gezegemiz.pdfIn PDF document text
    • http://koddous.com/userfiles/file/33566847912.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/75293001738.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/62584707230.pdfIn PDF document text
    • http://umhouses.com/uploads/files/wajevazubi.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/94150901991.pdfIn PDF document text
    • 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_off0000e315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 19116 bytes
SHA-256: 105238d68f26234ca6ec495e17bc5721b0adf8fe1dfecfa86a6b9fa35e3e08ab
font_01_sfnt_off0001148e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148E 10592 bytes
SHA-256: 6015e04b06eec2780a25f4375bf31d6a9ac112ef65e401a35aeb177b873c8267
font_02_sfnt_off00012c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1