Malicious PDF — malware analysis report

Static analysis result for SHA-256 93825886f403d671…

MALICIOUS

PDF

97.5 KB Created: 2021-06-01 05:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ca2538d6d0e88dcad63b531f42bcc1e1 SHA-1: 024aa39fe7adcc4a3ffda25abe9d7259802c1367 SHA-256: 93825886f403d671b594d6c378d0327b6f4a3d32ac266a9a323f3afc58fdaa8a
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to disposable hosting and redirector infrastructure, suggesting a link farm designed to phish users or distribute further malware. The presence of numerous links and the PDF structure strongly indicate a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://dafemum.ru/wb?keyword=tommy%20emmanuel%20those%20who%20wait%20lyrics In PDF document text
    • https://rulonejuwa.weebly.com/uploads/1/3/4/7/134749835/vunodilikej_fokaju_kitabile_kevazirinad.pdfIn PDF document text
    • https://bolefapazudakaj.weebly.com/uploads/1/3/4/4/134478960/daxenivadawer.pdfIn PDF document text
    • https://venivuwaw.weebly.com/uploads/1/3/5/3/135308653/nugamegenenoku.pdfIn PDF document text
    • https://xivenisulebitok.weebly.com/uploads/1/3/1/3/131378814/86a6b513e.pdfIn PDF document text
    • https://logosomuzabi.weebly.com/uploads/1/3/0/9/130969340/39c90787.pdfIn PDF document text
    • https://lajonomopizu.weebly.com/uploads/1/3/0/7/130739457/wurugobujubinuk-dixevililemin-purabolaxozer.pdfIn PDF document text
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/7402251.pdfIn PDF document text
    • https://wibotutez.weebly.com/uploads/1/3/4/0/134012840/1c7811e20f79f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c266614-8674-42a6-a84f-d4f7a3ce18f4/54673081512.pdfIn PDF document text
    • http://mikabipi.pbworks.com/w/file/fetch/144431982/how_to_make_a_sponge_in_minecraft_1.16.4.pdfIn PDF document text
    • http://wijozuzapusa.pbworks.com/w/file/fetch/144438123/transport_phenomena_in_biological_systems_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf8e9ff5-725e-418d-8fe2-9460e767e8e9/english_grammar_quizzes_with_answers.pdfIn PDF document text
    • http://funinupun.pbworks.com/w/file/fetch/144424899/38086348744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7698c46d-bb6a-48b9-9e77-0f67436bde72/mba_supply_chain_management_salary_in_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa734c68-21e3-4735-9fa4-6ea55b96a488/flavorwave_deluxe_oven_manual.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/w/file/fetch/144423945/ps3_gta_5_cheats_download.pdfIn PDF document text
    • http://zajozote.pbworks.com/w/file/fetch/144437736/formlen_for_areal_af_en_trekant.pdfIn PDF document text
    • http://dibesusajob.pbworks.com/w/file/fetch/144440793/melituvevemakeliwagemifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6812549-cb66-4c06-bb8f-5d4c51af6735/2781817079.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144415905/90599145744.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000141fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FB 5180 bytes
SHA-256: 0c59083d98db7e9176e7e3452815a37b0547156d3106e4d5c5f470d09504ad3d
font_01_sfnt_off00015383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15383 10920 bytes
SHA-256: 78eef4b183947251348d02480272bd47100898a0218d5f131b456b569730df66