Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b0e7ccc5d6012a…

MALICIOUS

PDF

92.0 KB Created: 2021-09-14 06:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e8ac12934fcbaa409095e4891c9bf739 SHA-1: f92e543aa243e920246ae3da6f1c6433c687663d SHA-256: 15b0e7ccc5d6012aa1265f0cb3cf224d4029d944a106b37b77ede2f5e9d0a8ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to malicious websites for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://smidgel.ru/uplcv?utm_term=verbs+that+start+with+y PDF link annotation
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/xizotedatodaxejideba.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/dusetodaguf.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/708414181.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/zumipabivezoxajanomewa.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109071937417946.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/vanule.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/waduxetuxuzanefazog.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/sulujisajisovebitiwanaro.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/gozamiweput.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/porimutitar.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/gumiverosezeb.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/fafibafebezufogovatofi.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/pedujizenamamabuvoxo.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/dababodirafo.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/61010193602.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/62558963106.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/jovojivomagurovopozalufib.pdfIn PDF document text
    • http://domplus.su/userfiles/files/46531652984.pdfIn PDF document text
    • http://allycatering.com/userfiles/32960062194.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/gokarafow.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/43232748841.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/supem.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/wudujiladimepoku.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_off0001046c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046C 10244 bytes
SHA-256: 6c92f7cf2d861d534944265c32b91adcefafd5dfebc06eb71492ef6bcf7ec0d8
font_01_sfnt_off00011baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C1 18192 bytes
SHA-256: 8b047b7261485a1ad0e68ee37166712cc1530ab5d8148fad52a395f487c90366

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