Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7db28a448b8b856…

MALICIOUS

PDF

77.9 KB Created: 2021-09-11 03:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 013b24b3cffb8cb9e8ee0272ebfc5331 SHA-1: 3630cb8ac09bdc4f2098b74b693b5b0048b672e6 SHA-256: e7db28a448b8b85672107640e343719c767db8053a70f37749399f095982fa46
126 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. The PDF contains numerous embedded URLs that point to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crewmak.ru/uplcv?utm_term=multiboot+ubuntu+windows+10 PDF link annotation
    • http://harryreichert.de/uploaded_pics/News/file/mokebinizesobigolexilita.pdfIn PDF document text
    • http://irths.com/upload_files/files/94938793407.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/lenafed.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/74696379945.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/kinax.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c6f347afcd6291cac473320a31e4f5d9/14349958654.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/67989171600.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/pukewovuluwasidado.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/doxigaxivazibibo.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/43489962794.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/zokuger.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/jopubutixaxexajalobikosa.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/37901970284.pdfIn PDF document text
    • http://torgoborud.org/images/file/gosadutokalavafaronomekof.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/6916220759.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/xifumuzarajagiposawuw.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/18749596756.pdfIn PDF document text
    • http://rococosofa.com/files/files/54516334462.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/42341009305.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/vawazu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613111b5c7b6c---70597573745.pdfIn PDF document text
    • https://wrd13.com/force/file/xikibulizakuzatujebovomup.pdfIn PDF document text
    • http://budropol.de/Upload/file/91022453094.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_off0000d04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 16772 bytes
SHA-256: 62fd6878dc794c28d5e12a38afeaddfe372ae6099b35f01f2370b9b2c374b1ef
font_02_sfnt_off000113f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F0 10340 bytes
SHA-256: 05a924692cc08d4bd2431ffaf676bc26df10d5b94ec398c6ae224ba030ddc78d

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