Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4c8ba390918674…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 09:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1c5f2ac6fe0d0f996effab6ad74fc50c SHA-1: 336b56bc2dbbc96d34cdcb552f872983c42f7405 SHA-256: 7d4c8ba3909186748915747abf734df0e36e758eb0dff873ae592efa15e35dae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to PDF files on various domains, indicating a link farm designed to host malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirms this structure. While no scripts were directly extracted, the overall pattern suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://annabarons.lv/files/files/derokurif.pdf In PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/75f4016ee27d2f2bb0284af4243159d7/27327839696.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/betegu.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/2790512311.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/vedebipemujupiv.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/49824101570.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/50641050561.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/91916580698.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/35180882733.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/53987619811.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/62522325213.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/20956361878.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/gobanonima.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/d2mblurcc8kn2jvji90pqops33/batetanitiboroxaref.pdfIn PDF document text
    • https://partnermind.cz/images/files/28339596386.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/mezotekelonapuwasabak.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/90472998392.pdfIn PDF document text
    • http://hiniceshine.com/upload/repeloreselogedisirela.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/6518206034.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/46310161458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=free+pdf+printer+driver+windows+10PDF 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_off0000d606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD606 19348 bytes
SHA-256: 5992c3e07ea93d5ff7e5c08428180c8ee8291f51fd16e090002bd9c3015f063d
font_01_sfnt_off00010923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 10584 bytes
SHA-256: ae088fa0b53478325e6c4d40e17c8451534bfc7a2fefb1a47626f01057fde4a8
font_02_sfnt_off00012179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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