Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fccac4a73a3cd7…

MALICIOUS

PDF

81.5 KB Created: 2021-03-21 00:15:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 63e9ec977c2f8a83b655cc778005f8ee SHA-1: c5d833c5e17d90c1fa55278d6dd6cfc75c0e9a48 SHA-256: 83fccac4a73a3cd7c01fb5a7a5dccc6e830bc44f1a278619a377020172febd55
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs further supports the idea of tracking user interactions with potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://leonvi.ru/123?utm_term=angular+reactive+form+builder+disabled PDF link annotation
    • https://cdn.sqhk.co/gonolesuzam/ieggrTd/2052550642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410191/normal_60153227c4535.pdfIn PDF document text
    • https://cdn.sqhk.co/resilano/xigQRig/bojogibobisoxuritexoju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408002/normal_5feb46f82304f.pdfIn PDF document text
    • http://goxamid.mypressonline.com/piscicultura_familiar_no_amazonas.pdfIn PDF document text
    • http://woxijakuzadajew.getenjoyment.net/93700335865.pdfIn PDF document text
    • http://lejifip.sportsontheweb.net/mademasore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410013/normal_6031011de286e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kavezusi.onlinewebshop.net/gevud.pdfIn PDF document text
    • http://bojepudadadax.atwebpages.com/6703685262.pdfIn PDF document text
    • http://sonapap.rf.gd/46163661081.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/22084632683.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/videpure.pdfIn PDF document text
    • http://jedipasewiz.rf.gd/14326361682.pdfIn PDF document text
    • http://savikolapuxol.rf.gd/washington_dc_newseum_exhibits.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE4 5528 bytes
SHA-256: f6f82091d4c3ae86441e31bc9ef90b7c407d2540f5652b277922baf2eae83551
font_01_sfnt_off0000f09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09B 2108 bytes
SHA-256: 69389ef689f8c86eac0e000972d65951e510e04873d32f756dcde3f6d35d2ff0
font_02_sfnt_off0000fa45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA45 11304 bytes
SHA-256: 31840929852af1c98217f9edb509ac5ea3ed2c779d82aadc8794c13046ab1d11
font_03_sfnt_off00012117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12117 16840 bytes
SHA-256: 2e0c258850aa8ea0839305467b18bf2a800c45f1d5da52dd3fc64ac940644fc0

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