Malicious PDF — malware analysis report

Static analysis result for SHA-256 beab454360afa211…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 00:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 423157283dd959a086552a34b1222988 SHA-1: 90caec6116b3b5c202ed69bdea4e607f193ccfec SHA-256: beab454360afa2112911dd253e76d0bc37d7dd143636f1ba019b30b2b82283ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users, likely for phishing or to serve further malicious content. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inimtrento.it/userfiles/files/18508383058.pdf In PDF document text
    • http://locthanhwindow.com/img_duhoc/files/20846858862.pdfIn PDF document text
    • https://fratellifurloni.it/file/kenizun.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/zodipofipetodorawo.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210904045326.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/22783154779.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/31375088900.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/javegivujosufalezosotunuk.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/gebizipunapuxag.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/gadun.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/tibip.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/jovopugogubul.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/vesekezagodatogobetazowu.pdfIn PDF document text
    • http://airsoft1.ro/files/file/bifibebobutenolet.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/nimarepojekuren.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/15605669178.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/47936315333.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/ferisukijezubogilijuvu.pdfIn PDF document text
    • http://reylab.com/userfiles/file/52470945238.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/kumitosirexuxetebanisez.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613818d7001c1---94208802500.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/7159509566.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/49550686801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=flash+rom+androidPDF 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_off0000dc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0C 17708 bytes
SHA-256: 88c3b22a27ad698a1b52e4b1e63fbdff3ce35b1c600499957c2931675fece397
font_01_sfnt_off00010a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A63 10260 bytes
SHA-256: 799e447f77b29db6c1e1170693f5addf4bb16305b2c0ebd627dd0f0c8b06dbb2
font_02_sfnt_off00012120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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