Malicious PDF — malware analysis report

Static analysis result for SHA-256 17fec603e22c13a0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 00:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 409172297b0a72d226f69ad35b8d2445 SHA-1: df04e1d47d62323bf7c44f7df805150a993ef773 SHA-256: 17fec603e22c13a09449f95f643ba1f18035deaf6daab44d40bc06d94b1595f4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many pointing to disposable hosting domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with known phishing lures designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://qualitygums.com/userfiles/file/gobunurebunesamisebamu.pdf In PDF document text
    • http://alhouti.com/userfiles/file/putox.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/29696861231.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132030e07d7f---jezosijupu.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/rudiparasofenuji.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/4e34a97bde59553d92edec286b6f42f2/22640581263.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/700049917.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/92607245161.pdfIn PDF document text
    • http://hidropro.hu/upload/marowomaz.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/64467890175.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/10553999047.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/21642729506.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/53166957280.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/92613136416.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///41925869150.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/tunarizadoles.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/pirubiwogiwapapipumu.pdfIn PDF document text
    • http://bienbao.net/uploads/files/28814964557.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/gubumigowumamub.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/xanewimipulesubafimis.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/rokidatutojenisutaxix.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/49959747491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=advantages+of+5gPDF 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_off0000dac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 17792 bytes
SHA-256: cb1ddf16d94b07f32388db3be5d077ef659e1a1644b2a713886d120dbc7a39ba
font_02_sfnt_off0001214a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214A 10472 bytes
SHA-256: becb3d6417d97d9027388ae8828a2e967afd7d1dd7902948ff0862764d2813ec