Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2fb7040249e83f8…

MALICIOUS

PDF

76.7 KB Created: 2021-09-26 14:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16f2fe0ce367cabb4d00167d3605897b SHA-1: 9a2a01fd351a8568e474fda41cdd63ecb8f89d4b SHA-256: f2fb7040249e83f840182da5775e87201a7bc411d38d44255bfafc6752c3c94d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting and appear to be part of a link farm. The embedded JavaScript likely serves to facilitate the phishing or redirection attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=remote+control+for+sun+direct+apk PDF link annotation
    • https://vzglavniki.net/data/file/moket.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/pozipeliw.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210918235355_noxife.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/galevafebewar.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/94208205516.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/11a94e6f1717a376c2e2accbb122e2a5/42276130228.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/32042123307.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/vurabaterekejolawo.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/getamovovok.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/81761355821.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/lunepanugoxibo.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210910233412.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/benudu.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/nomebavelasapinixagu.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/71623860223.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/kuzexofo.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/68472557154.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/47856615186.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/23768629813.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/pqo6sucphajef59hgv30uuns28/11298955271.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210923_DB4AC54F320FA286.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/duzenitetufopudetel.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/34853916479.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210921102433.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/bisamipidipejemubupasem.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_off0000b838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB838 11016 bytes
SHA-256: 9133a49b1336a7ab46886dd5de2203f437dbde5591beb1d8e1b17d51e6043847
font_01_sfnt_off0000d1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E8 22560 bytes
SHA-256: aa1833c7b1e92462a640140fe947d9c2011c52a7ed7138ec15aa618b08a8a741