Malicious PDF — malware analysis report

Static analysis result for SHA-256 8649b9af4b986016…

MALICIOUS

PDF

70.5 KB Created: 2021-09-14 09:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cb871f40a0284e23811aca362511b98d SHA-1: 79d481d12030afc372bf7b6ba4cd3e9a68f601c8 SHA-256: 8649b9af4b9860167ba69a449278d447d8aebe3d761b6b0c4487fe5ffad50edb
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic 'SE_CALLBACK_LURE' strongly suggests the document is designed to trick users into calling a phone number, consistent with callback phishing or tech-support scams. Numerous external URIs were extracted, indicating a potential link farm or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://philabc.ru/uplcv?utm_term=formation+of+chloride+ion PDF link annotation
    • https://centrumschoolka.pl/photos/file/88885551214.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/fikujapediw.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/pabalosulu.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/42769929002.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/dagotiv.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/xoverimurewawadanexesuf.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/33931111853.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/78983672116.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/71461227835.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210904112313.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/jarubasetelagob.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132729f1d1a7---60865336605.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/selalubobab.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/sidomitoz.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/3c15c16d9adf653f0f2ca17d871f4b70/mesisiwavujesoje.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/37236462093.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/zavafesilol.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/zemetasafulawunojemuni.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/jumapodidumuliratovipevop.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/vozujivirebixesovetewow.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/74355614898.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_off0000b121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC933 16984 bytes
SHA-256: 9d7a7a47e062c0d127fc0ec157c810666ef625fe84882268d7e397191580a428
font_02_sfnt_off0000f50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 10552 bytes
SHA-256: e2cbf9ec1bebe9c6bf1e414682472d7bdc38ef5fb95bb44ce35a02980a43a4d5

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