Malicious PDF — malware analysis report

Static analysis result for SHA-256 56abfe56119f30b0…

MALICIOUS

PDF

80.0 KB Created: 2021-09-10 14:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2b4ee8255a644eaea9af06ae32cc95f SHA-1: ae5f673aadae97a865840ea4e302eff1000f2e3e SHA-256: 56abfe56119f30b01496074004147b25febc9056cc56068d1609d73dfc4ec357
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm or download lure, potentially using urgency language to prompt user interaction. The presence of numerous unknown URLs suggests a distribution mechanism for further payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://hatdesechia.com/storage/ckfinder/files/83861160147.pdf In PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/gipirelirirug.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/42469019719.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/92060614583.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/32484108501.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/suxawedepejoxu.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/muduka.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/59605844345.pdfIn PDF document text
    • http://chamdure.com/DATA/files/sunidanibinid.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139487c6e88a---mujulaforuvubususe.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/zezobemigebiwagoxovepuke.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/18465581539.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac0ed2001e---4251009554.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/19254391247.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/sununijofuvozisukipapo.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/6894875923.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/nanasuzobowogeporivip.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/24081339685.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/mosilimunotuwewedu.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/venifipekupozanilofumo.pdfIn PDF document text
    • https://advik.net/userfiles/file/30219838220.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/239118946.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/juzuvasibirumumigolu.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/59176742932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=off+the+road+otr+openPDF 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_off0000d660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 10312 bytes
SHA-256: 2473e03c94b8ed7284a5a12dcf3f7c08cb92be72b464cf88fae065826864134d
font_02_sfnt_off0001059f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 17348 bytes
SHA-256: 38ee740a196a1e6e8baf971f743ffb8148834d208e5394def550812ae0b50f85