Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d4d1ab2196a2c8…

MALICIOUS

PDF

92.5 KB Created: 2021-09-13 17:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a7e80da301274bd0520eb738739edac8 SHA-1: 1759b3e0b37242158a77f4e85fd8e5c04b706810 SHA-256: 79d4d1ab2196a2c8142384e3722bc3326d64ce88c27701343be65ffeed3c1907
166 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CLICKFIX' heuristic suggests a social engineering attack where the user is prompted to execute a command, likely to download and run a secondary payload. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://amrapalispot.com/userfiles/file/77084439261.pdf In PDF document text
    • http://galsabino.it/userfiles/files/61162060255.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/38553526862.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/wanogusolisirepodeduxab.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/69800936891.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210913031458.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/gujifalisozagomiwunonux.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/velane.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/65822224428.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/40344545451.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/fipixigepi.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/59913241003.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/77569392217.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/82785247913.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/pejaxepizenivuzod.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139bfacddd68---64697058056.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/panadevizakovinubon.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/ligofapuf.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/fominotewiwobujibubutawi.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/moniguzuvip.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/89376988417.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/5638394408.pdfIn PDF document text
    • https://aayams.com/userfiles/file/68859269146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=block+launcher+modPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EE 25280 bytes
SHA-256: 4f685089002429331cc16e5921d6cc1586c1c6ff13a4afe7e140e79f9101c284
font_01_sfnt_off0001155e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155E 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8
font_02_sfnt_off00011e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E16 10520 bytes
SHA-256: 507d63da9d46986d2598b6a156f9459fcc38806bf03f76d18348c55b5c68f032
font_03_sfnt_off000135d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00014de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE7 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d