Malicious PDF — malware analysis report

Static analysis result for SHA-256 5835b0e66e969153…

MALICIOUS

PDF

76.9 KB Created: 2021-09-10 23:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0cbb56487a692149769d7601532679ef SHA-1: e931d8a1596b561520738d1734efc40ba8e8a305 SHA-256: 5835b0e66e96915388e20ed2c9fb4a3bdff55fb22028b6f50d644e9ec9927176
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to trick users into downloading further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to obscure the malicious intent through a large number of low-reputation links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=ludo+game+download+mod+apk PDF link annotation
    • http://asude.istanbul/ck_images/files/redarigegepujebeval.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/75741691451.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109031520313754.pdfIn PDF document text
    • https://anup.bo/images/files/fuxaxakevunixinesazusaj.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/4709112696.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210909113123.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/muwujagitipekemesanatij.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/27oldjknqgimg31tuuf4m7uvg7/pobizuwit.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/xexasesini.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/26571240662.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/taziforipikefeposuwupex.pdfIn PDF document text
    • https://clinicscrm.com/img/files/polalopep.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/93481020178.pdfIn PDF document text
    • http://elskenecologie.nl/files/31412573819.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/diwozesasezikemazif.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/18170676056.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/lilepidigig.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/lemibedat.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/42945455692.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/72256794651.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/bugugegifi.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/nogewike.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_off0000c947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC947 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15E 10512 bytes
SHA-256: 56566486ea134405b523c64b7417f8317117f82451f3547f761db4e374c7257c
font_02_sfnt_off0000f90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90E 17688 bytes
SHA-256: cc0f8534ea493f816cdd0a898d8464f792947cd277ff96111c1b359131f98841

Open this report in the interactive analyzer, or submit your own file for analysis.