Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef134a201509ae6…

MALICIOUS

PDF

80.5 KB Created: 2021-10-08 12:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f2baff71b793d05b812b6317d5407da8 SHA-1: 8853d49091a7240ba5575e9001d9ab7100e136de SHA-256: 5ef134a201509ae6e1f167dafb42b6f4cf2763adc4dead19ac3d6115fce49c32
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://stonebreaker.at/wukuwavipe.pdf In PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021982250492437.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/66699875089.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/66075717567.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/61765104149.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/6a896cc6f49dd3ed51b6d6192b659506/50922402757.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/38621847728.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/47624965926.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/bizinalanimifakavujetop.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/bupupiruvafunidovokur.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/25922138055.pdfIn PDF document text
    • http://didopack.com/files/49644394405.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/96376431385.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/9438776132.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/nuved.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/79751294131.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/8792597344.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/xuwekalu.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/82392003617.pdfIn PDF document text
    • https://www.patisserie-flechais.fr/ckfinder/userfiles/files/mefupizumewozux.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/mupepazozuroromirewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cam9+test+1+reading+answersPDF 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_off0000d607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD607 18260 bytes
SHA-256: 9b68610141b2a0c916803287a17083893ff88fc69201cad03bc0ef523fb46cab
font_01_sfnt_off00010477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10477 10764 bytes
SHA-256: f99608c17a2c24cded08b2d89d8ba938e1555ed86c6ba3a6984654e7c992a6c1
font_02_sfnt_off00011d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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