Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d31045606b5ff5b…

MALICIOUS

PDF

66.5 KB Created: 2021-10-03 09:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bcec88164df724112cdaf46c2d9801db SHA-1: 97b6d2a8c8608197b0c0a3f8f360abd00c2a1055 SHA-256: 8d31045606b5ff5b74e882bc6b0db591e69ce3607108de0cce3dfdd534a8d767
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including a link to an algorithmically-generated URL and classification as a link farm on disposable hosting. ClamAV also detected it as a phishing trojan. The presence of embedded URLs suggests an attempt to redirect the user to download additional malicious content, likely another PDF or executable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5022

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://guruamardaspublicschool.com/userfiles/files/95865547088.pdf In PDF document text
    • http://skpizzasubs.com/uploads/files/84097869220.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/71856842571.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/96161681936.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/75241472489.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/70405767813.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/bixasedeja.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/58999769621.pdfIn PDF document text
    • http://redactron.com/userfiles/file/mopuxutuwumef.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/99995449528.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4df6som6ssjaedd59u1lv1p0jh/tuzenupawu.pdfIn PDF document text
    • http://bptramptour.pl/files/file/82312405113.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/85975844517.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/15934015501.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/38322599601.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/loregemanipexejupo.pdfIn PDF document text
    • https://podimercrm.com/img/files/13506934686.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/gisunusigemoxixeguturo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161593c6da4220---88484917147.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/94235016756.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/vujod.pdfIn PDF document text
    • http://africareview.in/userfiles/file/luwemavowekomozip.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/dujojanagefitiwuw.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/bajozovalavufeja.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/76199072028.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/29693651347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=accounting+principles+12th+edition+chapter+6+solutionsPDF link annotation
    • 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_off0000b165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC977 15808 bytes
SHA-256: 6fe3fc710f1a09b8f7501fd04315793d206c4d4b754e5f21e1fcf8aee2cc3848
font_02_sfnt_off0000f182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF182 11212 bytes
SHA-256: d4b328f20ab3e48c5ae957f31557b10ecdd2349bc810ac91edacfdb5d0ea1977

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