Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc9b6a3dac55d5c…

MALICIOUS

PDF

71.5 KB Created: 2021-09-16 16:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ad055b15ce46ca1c28ab28a6d9ff71e SHA-1: e065501301d9905cb255c734fe09fdd95804d76d SHA-256: acc9b6a3dac55d5c6e153f41c5d1df8d388391a2ff1b26b60f87cac55543a4e0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to a raw IP address, suggesting it acts as a lure to external resources. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm hosted on disposable domains. No scripts were extracted, but the PDF structure itself facilitates redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://allytemp.ru/uplcv?utm_term=justice+league+flashpoint+paradox+online+free PDF link annotation
    • http://mizuho-co.net/file/ck/files/98999510773.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161350b75576f9---97576863474.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/mepabagegafe.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/57047114332.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-11/20210911135944697453.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/karaxa.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/gefabekejudijevuwag.pdfIn PDF document text
    • https://digireg.it/upload/94190851213.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/59871526075.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/xulajubagagifasabaxewox.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/45782816306.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/zojibukozikifoxi.pdfIn PDF document text
    • http://video-cycling.de/files/file/juralebulomidaxu.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/94351006551.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/daxen.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210908_160710.pdfPDF link annotation
    • http://eskuvoiiranytu.hu/blog/file/zesabamofarosivot.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_off0000b334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB334 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB46 16988 bytes
SHA-256: ba8d45b69b758e9508f6b44ac1ab82e3418e64138f7c478c72208f88f496cf02
font_02_sfnt_off0000f742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF742 11092 bytes
SHA-256: 21f18588c512c89fb1779e56f9a13361db9ad76267a32a40b5820150f9b535e3

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