Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61f140a56cb7ba3…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 05:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bfc06c5951fc7cd29de7afd2a5cef1b1 SHA-1: 341bea5b01363f471c52a70a719e874ea93d4c57 SHA-256: a61f140a56cb7ba3544a2bf477d679bb67ddd6497975c72038a04fe0eca61e65
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, many of which are hosted on potentially disposable domains, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the presence of many unknown URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://phanphoiongnhuahoasen.vn/upload/files/75612128246.pdf In PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/getisaguwetazubaluxirux.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/53894683203.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210909023730.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/47501259045.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/vewavoda.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210908161107_mz25j6.pdfIn PDF document text
    • http://myslizdrave.com/soubory/87667401495.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/316b203eaa28ac146fb865aa062be980/sigosodilumoke.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/jexenosakagu.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/96451263788.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/jujupolon.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/62614641941.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109031249489342.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/51647150679.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/44246839900.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/81881577330.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/53876149418.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a103b9c7f9672b514bb0a0eef14452b0/setufeberimofema.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/jasosoralovi.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/fudis.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/55625569737.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210902_DBDB9C2A4D6B7CAC.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/34796096556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=watch+mamma+mia+2PDF 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_off0000d99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99B 9940 bytes
SHA-256: 46c56bf300b4408d49d56e63f4c46222779bc2eb9a6b4023e2f4cc7325ce52ad
font_01_sfnt_off0000efa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 18304 bytes
SHA-256: 8d37abfc4051c2011d67d7746567869c45fe79a973674f16a5c073c19e6df515
font_02_sfnt_off00011f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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