Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7e971d5d53435f…

MALICIOUS

PDF

71.8 KB Created: 2021-09-20 03:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c84c2d48dd28efbcf8042e568f2cb954 SHA-1: 37b4d0b293ae25ed15aad566c1ba42cc49f4d35c SHA-256: 9d7e971d5d53435fe06b25eb33320f04c3012b19107b488a22835ea0747d0955
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, pointing to numerous distinct hosts, likely for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://ipayon.com/root/FCKeditor/file/72803199876.pdf In PDF document text
    • http://mopron.ru/upload/files/15655258804.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/faropad.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/29125158459.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/kigaji.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/78691587609.pdfIn PDF document text
    • http://fereshtegan.net/basefile/fereshtegannet/files/17166229424.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/bazuzulaxo.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210902_40BA56D14993FC10.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/70636676427.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/46887451042.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/42810866591.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7427080b8---45708129847.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/tivutixaniwiboxexib.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/vegixobapuvopoduva.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133df8b3ce67---vetirabubafukobavu.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/22454399065.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/99385512079.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/32173727979.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/39070735579.pdfIn PDF document text
    • https://coevent.ru/upload/files/gawunenikerumikosage.pdfIn PDF document text
    • http://venkateshservices.com/uploads/bosoda.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/rikumezijazas.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/50913726489.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/62314777416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=download+games+for+android+free+offlinePDF 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_off0000b94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD163 10688 bytes
SHA-256: 05ea09fcabb380d9e53bba0095bad3cf7a9bd6560bc8a90919b3311d110a6237
font_02_sfnt_off0000e9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AE 15400 bytes
SHA-256: ce02fa8ee6a175ec56509432980574b1c003e3058d50783cfd0a846aa0c46366