Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fe488112d2908e…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 01:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 932ea6e1171711fdab3ea44d370bee35 SHA-1: 23ab2a78b6b654f694cb9c68e63c26055f769447 SHA-256: f4fe488112d2908e065fdb38a4926640b606bcbff47d4d3d302f95b4a960194f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded links, many pointing to potentially disposable domains, indicating a link farm or phishing lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an attempt to redirect users to malicious content.

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://sangjeom.com/userfiles/file///8555302100.pdf In PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/disufobevagudomutubejat.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/sijene.pdfIn PDF document text
    • http://tcihk.com/userfiles/tukugegusikineboguz.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/98709622594.pdfIn PDF document text
    • http://njchemland.com/upload/files/5928655813.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/75231052471.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/jipepamakunijijaxuzifepo.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/gabagukugoraxatuwesemo.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/56617274258.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/xulapuf.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/wowatibumaf.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/sakinajekomujux.pdfIn PDF document text
    • http://quinta.cl/upload/files/podanalefoxonokexam.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16141d704714c5---42766191696.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140b985ed348---80639708135.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/87605617015.pdfIn PDF document text
    • http://epmachine.ru/d/files/megabebavetuwemujuviruwes.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/zedamigolenegodo.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/kenenujadal.pdfIn PDF document text
    • http://chinahongji.com/d/files/gilavutoxelozowopon.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/29021022310.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/wikenakepemap.pdfIn PDF document text
    • http://juentai.com/userfiles/files/veriditakufezo.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/tobewepefivusipadaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=cyberpunk+2077+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_off0000dbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB3 10488 bytes
SHA-256: 55e977023861a373d01324b47e8746915dfbc3a4b2facb0911df49f4700ea45c
font_01_sfnt_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 17976 bytes
SHA-256: b26d2e736a2555b912d1f63acc4a6c783ed9127630590327a9671b9c4754724e
font_02_sfnt_off000121e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1