Malicious PDF — malware analysis report

Static analysis result for SHA-256 316ba380914c2585…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 08:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f64604ce37f7cc32de0a73df7123418c SHA-1: 90d4fc4c691b9376abdb32027109bcd5fe832f7d SHA-256: 316ba380914c2585914d31c46452eab02e6a6cfd053a150134959e5b394a0688
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, with one specifically identified as a link farm on disposable hosting. The PDF structure and embedded URLs suggest it is used as a lure, likely for phishing or to redirect users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=can+i+retrieve+deleted+voicemails+on+android PDF link annotation
    • http://fasson.vip/images/editor/files/zutikizeb.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/89462195221.pdfIn PDF document text
    • http://kes.org/upload/editor/files/57041966110.pdfIn PDF document text
    • http://marymo.ru/uploads/files/30061688168.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/15351582920.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/piruwedi.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/makejedebavarazanebom.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/20646046955.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161428c2029dcd---61200789258.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/70310750772.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/kipekelawediwarani.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/97173859427.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/tepufude.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/38692486167.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/zuwososezolenaxox.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/50329882003.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/kavuwilukedixakijixe.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/nedibivipulo.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/baloxanodilonowomog.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/81437145215.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/5103683040.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/8944873309.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/mevigeduxipag.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/99080914057.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_off0000d71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 17804 bytes
SHA-256: f9dd65a264850bbd3905aa24ee6f4d5c2510a8a10a745b7811757f88f0a1a012
font_02_sfnt_off00011d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D48 10628 bytes
SHA-256: 91ca8affe7167bac715781e376cd9a31731391004c981bf6322112862ee5a4c4

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