Malicious PDF — malware analysis report

Static analysis result for SHA-256 147c6e240fc1074a…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 03:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 71a5efa3caa1deac67743df555db3cb5 SHA-1: 88874bb63c07285a2afd8ed1f24020f05b5da0f0 SHA-256: 147c6e240fc1074a3d77da40d9b7bad20ae6262e033f89538cc0725bcf85be02
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and ML classifiers as malicious, specifically as a phishing or trojan delivery mechanism. The document's content, though heavily obfuscated, implies a lure related to recovery secrets or private keys, likely to trick users into downloading a malicious application. The numerous external URLs suggest a link farm designed to host and distribute the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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=applock+lite+apk PDF link annotation
    • https://cauthinh.com/luutru/files/80087381910.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/pitoza.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/sewibis.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/63107410374.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/48228556823.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/72152588626.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/15733717865.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-19/20210919204925254308.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/lfhv80v87bm1n1vbuvgh72vt7k/93631289091.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/98275636036.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/dedikorafojab.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/kexedolijopa.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161398d1228107---15097968812.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/21632959760.pdfIn PDF document text
    • http://pjteam.hu/uploads/zapubizifokokovuten.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/vidunekewijibuli.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/pevewamivatigigepenobu.pdfIn PDF document text
    • https://cooperspick.com/files/1502637095.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/vaxujigikul.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/ladasolin.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/nujolosiwugofiroxi.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/sabirosugejurapiwomexij.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/juvubetorelorune.pdfIn PDF document text
    • http://langyupharm.com/upload/files/jeposolotuvixup.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/vifagujapariredu.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_off0000d9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 20108 bytes
SHA-256: 2946a6d26e52aec4d0c553d4905078129b9070ef76bbcbc4a6dac6539769fd82
font_02_sfnt_off00012646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12646 10068 bytes
SHA-256: 15fc029f5ea6f352a9e7a0114e0d728b732d7633047dce48ff80341cd042a5b9