Malicious PDF — malware analysis report

Static analysis result for SHA-256 92bfcc135587a2f0…

MALICIOUS

PDF

87.7 KB Created: 2021-09-14 22:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9cc1761d7d60bc38aae6dbeab46a2ba7 SHA-1: 31770701a35544a0615a0bd28ea136838cd43c42 SHA-256: 92bfcc135587a2f00b50f945ea2d553fb62f732c2baa79cdbe6942c74e2382c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, many of which point to other PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of a Google feedproxy URL with a 'download mt manager apk' term in its query parameters further supports the lure of downloading an application, which is a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://lotte-ppta.net/beta/assets/file/21957574209.pdf In PDF document text
    • http://hanasushipickup.com/uploads/files/13703691693.pdfIn PDF document text
    • http://chayka-svg.ru/files/78465568861.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/51607762243.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/fuvaku.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/47395490436.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/77351667153.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/74001243517.pdfIn PDF document text
    • http://wickedcheesy.com/images/file/nutive.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/83246558712.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/duraka.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/tafulivobexi.pdfIn PDF document text
    • https://zzwgjx.com/d/files/tonidimavinoxedi.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/66390530776.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/gevofikuz.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/jukulamenimakasoraja.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/vorivot.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/jofevizegefesediribukul.pdfIn PDF document text
    • http://marine-inox.com/i/File/26149876192.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/39395071755.pdfIn PDF document text
    • https://attack.lt/images/files/tuwowufalezuli.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/84472455167.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/xalogovugumagokigoliv.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/rexas.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/61231657180.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138d006b95f8---76203163606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=download+mt+manager+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_off0000f035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 10656 bytes
SHA-256: 05c254d0ceee6af3c3bcb2b55d227f3ff127db545d0f3105b8dab4d1c360b242
font_01_sfnt_off00010869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001207b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207B 18568 bytes
SHA-256: 79bb7f96a5ae52673fd77c9a9de9b48d1394b7d313c6e362119385804126905d