Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6dfb3358fc2138…

MALICIOUS

PDF

76.7 KB Created: 2021-09-19 18:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3123c4c7260a1b3299f746aaf04bbcf1 SHA-1: c6916690b50cf03bf945174949c68dc0994e2785 SHA-256: fb6dfb3358fc2138d632a3a895be4d5b0695f9c20108e3af7c22c9c9530309f9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one with a 'download' related utm_term, suggesting it's designed to trick users into downloading a malicious file. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=fallout+1+download+free+full+version+android PDF link annotation
    • http://sambometal.com/dataroom/file/99051358701.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/kukefamafetimatatekus.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/10349926798.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/15876814879.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nalefojulivalixo.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/42523744222.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/42357492740.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091021023544200.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/rizexavitimonesu.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631737627CQAY.pdfIn PDF document text
    • http://gro-felix.si/uploads/kawijerezodenigudiviw.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/97041739963.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/kewixezeramotesasewo.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/55998660540.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/21777318980.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/xubur.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614564be23b7b---dovofenov.pdfIn PDF document text
    • http://nova-auto.com/upload/buxopopugawuxalepugav.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/61549733055.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/bolidaxigododerul.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/sagisukopiwixonejofebik.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/xadixulepuwima.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/62556918905.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/jodepagodo.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/tajoxisotukekiwu.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_off0000c716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC716 10628 bytes
SHA-256: 006370c696c4aba3da8c848ad9603ba089dc06c090c801c52058310d4abe1413
font_01_sfnt_off0000dfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA1 17420 bytes
SHA-256: 8362b859f3890c952aee11015f60988f1a5d8562dc98a28969696ee3b68379b8
font_02_sfnt_off00010cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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