Malicious PDF — malware analysis report

Static analysis result for SHA-256 d867686c6b781b45…

MALICIOUS

PDF

84.7 KB Created: 2021-09-13 03:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 614bb2f6acbf062db8997daadd9185bd SHA-1: 90b821eb7d7b6d3873b8f1cef7005eca4dee7bf2 SHA-256: d867686c6b781b45ef282cb03ef46cd614c6402658c160be50e9ab8465349b49
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, with one specifically identified as a potential lure for a 'star tracker app android'. The presence of multiple disposable hosting links and the 'callback phishing phone lure' heuristic suggest a phishing or scam campaign. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pixomot.ru/uplcv?utm_term=star+tracker+app+android PDF link annotation
    • http://sibinetweek.ru/userfiles/file/13779048094.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/safugupejofunu.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/mevofedelatufasimonutesam.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/lujogerevululofowak.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/rezalevadijivu.pdfIn PDF document text
    • https://durimawar.com/contents/files/93695166923.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/94834315258.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/8363343369.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/kajazibulip.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/mesadiragozudoresi.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/fowinikakaz.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/97348635479.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/kafebugepawokare.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210907092102.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/4387791099.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/vadixeziramodadejawobife.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/76522159782.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/diluvazimubejifunu.pdfIn PDF document text
    • https://unaizahic.com/Files/files/novuwozumagelil.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133640232e79---31593073740.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/tezugix.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/luxuziragibilupere.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/6722999208.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/jatagodakavubipir.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_off0000e952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 17168 bytes
SHA-256: 5cfb11b6b4bdbb4869476d32b398867d7036b48bf0c4ae47688d2741b7ecaf18
font_01_sfnt_off000115c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C4 10460 bytes
SHA-256: b9f76300b8f906a139657e3ac5334bb900e8e00ff2cc6a50da4daa026ffef348
font_02_sfnt_off00012d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1