Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a216c8026a5e2e…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 11:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5be051b39544bf6313f6aeea85b6d62b SHA-1: e4ec08bb1a1be7c97eccc715a718ec93db632f84 SHA-256: 63a216c8026a5e2e682e813024cbdb7bf6d5bcc8f50d832089363a717384340a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a large number of external URIs pointing to a link farm. The PDF appears to be designed to redirect users to a collection of other PDF files hosted on various domains, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kidneystonetreatment.in/userfiles/files/raralawojeturuxis.pdf In PDF document text
    • http://akademibt.com/resimler/files/41063198056.pdfIn PDF document text
    • http://come2menorca.com/images/file/11643101650.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/49785260059.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/75599842892.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/kunimasubafumodogapis.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/lisedup.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/74924941580.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/fetive.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/43920641713.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/vpm30uanj5omkigg52i4ffokg2/26784859800.pdfIn PDF document text
    • https://majubesar.com/contents/files/24872378421.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/bebopunize.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/zamovixakuviwa.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/fivugoxaxuke.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/35459732082.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613059c1c20b5---nanituvigewusone.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/52792672958.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/dowugalimukarap.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/68456794190.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/gisukuz.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/25134020877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=fake+credit+card+image+generatorPDF 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_off0000dcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC0 10568 bytes
SHA-256: d08e2b26ad23d161c5cec269958aef469095ff74fc72c4d11223b1c105c7359e
font_01_sfnt_off0000f4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 17784 bytes
SHA-256: 999ea3dcac7faf59bb72500f16d581e99b564e7bdfe50c599d706e5a6f6df25b
font_02_sfnt_off000122f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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