Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb0d042bbaa7167…

MALICIOUS

PDF

87.4 KB Created: 2021-10-10 02:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8eb4b42fb6ddff58616b46a8b85b9842 SHA-1: 870bdb936cc459b89787c002816ae365a4cd3ac9 SHA-256: 8bb0d042bbaa7167d21722d533ea9d64cb5de8c588f067bd3e86b2add4c8d0af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this purpose, with many links on disposable hosting and UTM parameters suggesting tracking or campaign-specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • 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://queure.ru/uplcv?utm_term=convert+resume+to+plain+text PDF link annotation
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66114405330.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/deluwotobabunivukijim.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/zidog.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/78061508932.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/luxesafanubigek.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/41451063414.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/fawato.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/65835791673.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/vusorutone.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/dolekome.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/95121477097.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/wovid.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a0a56a0b72878819a09c992deb62d64a/bozufozavopopejonitesoje.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2a0dce0838603354050b0cd6ebad19e6/99513091299.pdfIn PDF document text
    • http://www.polni.si/Images/files/5062434176.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/51130639284.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210919001707.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/naxafitadetiburedixuxiwa.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20211008_080135.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/46813930003.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/85703798194.pdfIn PDF document text
    • https://vanchuyensahara.com/site/files/foxereguwebovonutebibu.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/77930725244.pdfIn PDF document text
    • https://mimpishio.com/contents/files/sulufazesomofanizulifovos.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/41356365695.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/wepowujikadimojoremapirev.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/48947464441.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_off0000ed3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 18896 bytes
SHA-256: e9572c9fe4d9d5b26ad671f519c791a9c027eea4a021d375876e2433f0c19a7d
font_01_sfnt_off00011edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDB 10712 bytes
SHA-256: 967838efe59cce4acaead6c82335cdf6443fa7a16b5ddf051e2b182c1f3e4de4
font_02_sfnt_off00013784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1