Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e8128bc9e8d366…

MALICIOUS

PDF

82.5 KB Created: 2021-09-10 21:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c9ddc67b70e0b0cc46569a1967e2368d SHA-1: b0a01f9754c08962fbb5dbc2832f80c6199c6c37 SHA-256: e9e8128bc9e8d366a151798ca838a831a85ea6085cd93ec0e2ad4e7271a82dcd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The presence of numerous distinct URLs, many pointing to disposable domains, suggests a link farm designed to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to lure users to external sites, likely for credential harvesting or malware delivery.

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://liur-krd.ru/userfiles/file/10987224310.pdf In PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/dosixojeketowubefaxekipez.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/zudiwuzavofilozopomu.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/65131189282.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/42866381142.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210910_104303.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/96285687179.pdfIn PDF document text
    • http://dnepropress.net/files/file/31502198733.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/s0jnclbgnr5ldsbkjgetahu6i9/76161943475.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/32953451293.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/tubujofo.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/2622927733.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a05b26c4e7---91288811020.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/xanoparixalarimo.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/13720108247.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/xatejezapaluzixibopu.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/zumuzejegajoxipabudi.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/80128216855.pdfIn PDF document text
    • https://spacio.hk/attachment/file/zukewefizizagalababigito.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/zegutup.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/xibimabulim.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/73231126900.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/94530848969.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/jibet.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/41148190760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=spm+test+manualPDF 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_off0000de10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 10276 bytes
SHA-256: 42a1db8ebee6c184f9ab5f4cd13735a27ff02da93726ad468c40780569417031
font_02_sfnt_off00010d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D48 18332 bytes
SHA-256: 153efc00e0ba3601857c48aef1de64bf1e280e53036b58ed87cb002b8be272fb