Malicious PDF — malware analysis report

Static analysis result for SHA-256 560c770d2e1426bd…

MALICIOUS

PDF

80.5 KB Created: 2021-10-13 15:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 887f4ae9e18043c72a13e1035a778adc SHA-1: f8c9afb93c8bd7eda38b39ed98780069fd0992e7 SHA-256: 560c770d2e1426bd767dffeb0efcf24e0f7fc9edf0c9603d57d4530aef455261
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and ML classifier indicated high maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm on disposable hosting, likely to trick users into downloading further malware. No scripts were extracted, but the presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://test-immo.com/file/31206455405.pdf In PDF document text
    • http://euromarkcreations.com/new/fck_img/file/sixesesovexejelopipedow.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/87233465739.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/82600619509.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/50292410500.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/belonedivufapok.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/rupigamapofolijokoxefip.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/42409030282.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/39364953763.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/87888979562.pdfIn PDF document text
    • https://sino-islam.com/upload/file/231318086696.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/nobuvusuferupuje.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/mivopunomofajevixixisuro.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/81121947977.pdfIn PDF document text
    • https://invision.buzyhub.com/files/25598978905.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/5701452002.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/furaruno.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/leloteji.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/94773260945.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/kamirogape.pdfIn PDF document text
    • http://midospa.com/upload/files/53893893493.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/ramumafen.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/47398644150.pdfIn PDF document text
    • https://rippa.pt/files/file/74747814733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/896FEnmJZlk/uplcv?utm_term=annotated+ib+physics+data+bookletPDF 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_off0000d3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D1 18560 bytes
SHA-256: d701cd9dfd8be8836eeafab45d5adadd6d91c7d4b9603fbc162936c2afb89e20
font_01_sfnt_off0001036a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036A 10840 bytes
SHA-256: 6db2c9737e04a1041eb697e0f2a134e3f2f86c2b485dd60e0ad7aaa4e883f67b
font_02_sfnt_off00011c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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