Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b51ee07bac2d77…

MALICIOUS

PDF

68.5 KB Created: 2021-10-02 15:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 980231617ce7a59d6847400dc11a9175 SHA-1: 77ec4c66b81bffef6dafe7c120755e9dd21f3125 SHA-256: c2b51ee07bac2d7766ff0eb482c968aabc2c5303e95b15e976bbf135a91dee72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, including those on disposable hosting and using UTM parameters, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are typical of documents used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://allytemp.ru/uplcv?utm_term=comic+book+drawing+reference PDF link annotation
    • https://quangcaowebsite.vn/uploads/files/feforideludex.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/bebutuzokebedabetuwiloxo.pdfIn PDF document text
    • http://kodemari.info/data/files/bimizawumexezuvilek.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/lupakuduvoje.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/milililiwi.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/dovotasedafefugim.pdfIn PDF document text
    • http://netflor.pl/upload/File/14140876514.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/22957623077.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/90423522397.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/nokol.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/37163341245.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/73780677968.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/narawezetezepaguwevaru.pdfIn PDF document text
    • https://projetovm.com/uploads/files/51636537083.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/71030740242.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f39a990772---67956607758.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/6826115172.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/22202711514.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/ropis.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/91335117870.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/siduxadegusobi.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/bogamorag.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/lujikibewebukeluwovowuli.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_off0000ace4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FB 10856 bytes
SHA-256: e2ddad7ac7f47450589700ace1c862bca2b13a9896063fcc58a34a0e3368a460
font_02_sfnt_off0000ddde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDE 14880 bytes
SHA-256: 3cbe2e24fb1234dcc837b50834e62c7245390761cc7c5819cf0fa68f66ea9a43

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