Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a0e9a805e5b162…

MALICIOUS

PDF

84.9 KB Created: 2021-09-12 10:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9d4c5ceed5761b476e0b85b5e4a01e5d SHA-1: d255ea37316cc9ca44a8a9802bfe5a11f9b8f826 SHA-256: b0a0e9a805e5b1625882d6749ceb5c6279fbf98cc657392378b56526fb25ca78
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, indicating a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is the intended functionality.

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 http://www.greddy.com/admin/common/ckfinder/userfiles/File/71282321987.pdf In PDF document text
    • https://jurvamartin.com/userfiles/file/rekapugunikusobimu.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/vosesinowowarumofog.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/rigop.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/tafixaralevijogu.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fivitiv.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/88048687242.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/mifux.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/91685402331.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/wuzod.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/14893154930.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/rowavewowelar.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/pixadukoxiduratogixepuzin.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f21b29216c---93013723312.pdfIn PDF document text
    • http://allycatering.com/userfiles/13548310747.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/44221431085.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/48695196460.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/nafuribirawajaraneked.pdfIn PDF document text
    • https://n-tlg.com/files/file/1599758089.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/96376242441.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/3761abb65416395ca993fcc835fe09e2/kimebil.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/39079669323.pdfIn PDF document text
    • http://epmachine.ru/d/files/63177116072.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/tuwubepirabasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=little+big+snake+unblocked+games+99PDF 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_off0000e37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 11068 bytes
SHA-256: 059d21d9f4e03d95e45f2b9b636c761da033822a23dde535edcf58f99d116c3f
font_01_sfnt_off0000fd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0D 18832 bytes
SHA-256: 0cddec133d26f9c2b7044d73234d9f0b9620845049e052262d4610be13853c47
font_02_sfnt_off00012dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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