Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec99e4c4682b5365…

MALICIOUS

PDF

70.9 KB Created: 2021-09-21 14:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a491ee9b3baa9178b6fc59c4e29042e0 SHA-1: df35f179ac435f270a4e8f46976218d3c257a2ee SHA-256: ec99e4c4682b5365393b5116ef8ba8ca4d4696a5ccd7d3e895f596cccf7e520f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to deliver a payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=auto+clicker+marshmallow+no+root PDF link annotation
    • http://oroblupiscine.it/userfiles/files/tesiguxejotikiso.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/8538670015.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090806364973499.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/netarufadadixerufevavabi.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/gipubu.pdfIn PDF document text
    • http://vinmexindia.com/uploads/wifimafalatuwex.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/bariguxesuvipuragaroxosar.pdfIn PDF document text
    • http://sql110.com/pic/65199357215.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/gizudisob.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/72140374729.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/digukilomenodezopimikefax.pdfIn PDF document text
    • http://wohntraumgmbh.at/51218775539.pdfIn PDF document text
    • http://www.memoriahistoricamalaga.org/ckfinder/userfiles/files/13564992254.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/lunewimefopalu.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/41714246327.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/77027874939.pdfIn PDF document text
    • http://pileki.com/imgup/file/ralenefugokububumexizedos.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/fovibipig.pdfIn PDF document text
    • http://anton-joyeros.shopcloud.es/ckfinder/userfiles/files/29574119351.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/potijofuzovun.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/raxupuvufim.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/4176756983.pdfIn PDF document text
    • http://markone-tools.com/upload/files/ripusevafefe.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_off0000b3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF3 16340 bytes
SHA-256: c71557a8de2ba709d6b905653a426f7cef52656bac2b24bdc53dbeeb21f820da
font_02_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 10756 bytes
SHA-256: fde46dcba16d8ec950d8dfb9719e3b8de53b11a9099cfb4b5a36bc7ffd22ba66

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