Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2c48a931fc6050…

MALICIOUS

PDF

76.3 KB Created: 2021-03-14 16:01:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6986d8379f6bc1a810ba89dc37781570 SHA-1: 2a2c7d49cd71b7a8c49871853a09d06056acfc22 SHA-256: df2c48a931fc6050aed6027a2e713556caf7939f9e88af8a1bbf919f7d8a4c28
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and it contains a large number of external links, many of which point to potentially malicious domains. The PDF's structure and the presence of embedded URIs suggest it is part of a link farm or phishing campaign, aiming to redirect users to external sites for further exploitation. No scripts were extracted, but the overall pattern indicates a malicious document intended to lead users to compromised or malicious web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/123?utm_term=frith+manor+primary+school+ofsted+report
    • https://sizutipaji.weebly.com/uploads/1/3/2/3/132303075/211826.pdf
    • http://lebizifijafaxim.medianewsonline.com/gakutasapapodarofimuk.pdf
    • https://zabugejagovim.weebly.com/uploads/1/3/1/6/131637755/7c8e321469.pdf
    • http://kataeta.club/oracle_sql_developer_installation_guidemj075.pdf
    • http://gratoraama.space/47346126756knpnq.pdf
    • https://devigafaviv.weebly.com/uploads/1/3/4/6/134698058/jojog_venije_darajipatizajum_gawimaze.pdf
    • http://vigastlens.xyz/dunkin_donuts_glazed_donut_nutritionzvpvy.pdf
    • http://helpcenter.business/9260609847692a8b.pdf
    • https://kopuzivepepojom.weebly.com/uploads/1/3/4/3/134330145/f6b9dccec58c8.pdf
    • http://mmmuuuue.space/pejosibepotumafebkhvq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pibajuwi/74871851310.pdf
    • https://uploads.strikinglycdn.com/files/e374ed13-4676-4718-9918-02defe9e735a/35280723998.pdf
    • https://uploads.strikinglycdn.com/files/f00f0f38-6c8f-4460-82e2-82d9d468be2e/throne_of_glass_fanart_rowan.pdf
    • https://uploads.strikinglycdn.com/files/c6c9b502-ed6a-486a-a91b-a2c805f03731/21091589737.pdf
    • https://uploads.strikinglycdn.com/files/57178d1f-f3c1-49d2-a822-e68b26707e6b/powekekirudefapalezed.pdf
    • https://uploads.strikinglycdn.com/files/be54b6eb-d8c4-4ffd-bc27-4037102376f5/favawil.pdf
    • https://s3.amazonaws.com/muxozuvalubi/34718999130.pdf
    • http://dubanexotokegel.myartsonline.com/74283249859.pdf
    • https://s3.amazonaws.com/xelimewat/gudezuforegujagijomareba.pdf
    • https://uploads.strikinglycdn.com/files/388e6b33-1a80-4a04-90fa-c1bc616e824e/que_es_titulo_profesional.pdf
    • http://nibizuladode.onlinewebshop.net/how_much_is_1_cad_in_rupees.pdf
    • https://s3.amazonaws.com/wizomoravazub/how_to_create_financial_formulas_in_excel_between_sheets.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec16.bin
a6e7c22d267d75a713c6fa02dad70d493a228370942071dd7799033ca368c150		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 5452 bytes
font_01_sfnt_off0000fe7f.bin
ce166843974736c5f5ecf8e0be686f3858cbe4a0ce69eb1687e0c000a5eaf6f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7F 10940 bytes

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