Malicious PDF — malware analysis report

Static analysis result for SHA-256 beaaeae48f115b1e…

MALICIOUS

PDF

79.5 KB Created: 2021-09-15 16:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29a70870376378c1a4b33696ad0fbd2a SHA-1: 65368e409226a4a230439533ed4e31e7d054f9ce SHA-256: beaaeae48f115b1ef78ec85257c5a2dd45ef9e740373db1eb452bffb72b7d75b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://krisoc.ru/uplcv?utm_term=how+do+you+get+a+ringtone+on+your+phone PDF link annotation
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161342afd41cfe---luvisuz.pdfIn PDF document text
    • https://mkart.it/uploads/file/ridujoserofupiwilefi.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/62988914615.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/12313428506137fb909eda1.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/45184700826.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/8946717735.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/25221047886.pdfIn PDF document text
    • http://congtyvima.com/images/Download/97668002378.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/53097153286.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/24836329037.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/moxipajugepe.pdfIn PDF document text
    • http://konberdbio.com/upload/files/jikox.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/73477265068.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/46148110111.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/megakuvebojute.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/zifuneb.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/1558094729.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/dojaludarola.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/walawemudo.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/dadevosudutesifinimivi.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/19741655296.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/82519548946.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/16152052667.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/5122904330.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/bevutirenudirisa.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_off0000d49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49C 16684 bytes
SHA-256: 31a3280472a14b62a0bc5c5ba093e64a9da4e6c3569196ac8dd1f6ad10a0ce55
font_01_sfnt_off0001000f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11826 10748 bytes
SHA-256: cce5e39a6ad28cbbec5a1e0af4d080fab17a9bf8feeab9e7e030bfe01aad355b