Malicious PDF — malware analysis report

Static analysis result for SHA-256 449d1e2b15e980cc…

MALICIOUS

PDF

76.6 KB Created: 2021-03-27 13:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5d03c820db0529a3767f0b04a1e1d761 SHA-1: 2036240b466f08b9066ed1aa5a4e67bb63004a03 SHA-256: 449d1e2b15e980ccd64af0fc2df278eb418924206268d1d0c2044568ca85615c
244 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with several pointing to known malicious redirectors and link farms hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO-based traffic redirection. No scripts were extracted, but the presence of embedded URLs and the heuristic firings suggest a malicious document designed to lead users to harmful sites.

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/strik?utm_term=calculus+limits+practice+problems In PDF document text
    • https://xatotowo.weebly.com/uploads/1/3/2/7/132740458/5323014.pdfIn PDF document text
    • https://fifekususelamib.weebly.com/uploads/1/3/5/3/135349053/9501606.pdfIn PDF document text
    • http://7gusevshop.website/208754173846f2t9.pdfIn PDF document text
    • https://nakabupibuf.weebly.com/uploads/1/3/4/6/134608610/9751410.pdfIn PDF document text
    • https://guxitubekin.weebly.com/uploads/1/3/4/2/134267073/87ae47ec31.pdfIn PDF document text
    • https://vebuwume.weebly.com/uploads/1/3/5/3/135349689/bufaf-vazemovig-mabezax-nakaxu.pdfIn PDF document text
    • http://boldly-grow.com/41599108971knxid.pdfIn PDF document text
    • https://gexoronigiz.weebly.com/uploads/1/3/4/2/134265935/rapokewaz_nezofatuzuvegaj_nogumegitenav.pdfIn PDF document text
    • https://jubigugatuse.weebly.com/uploads/1/3/0/7/130775741/8231ad29aba967.pdfIn PDF document text
    • https://kunatelifarak.weebly.com/uploads/1/3/2/7/132712072/bokodekaku.pdfIn PDF document text
    • http://reawolt.online/zikovexufs2azj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/de725e61-bef8-4814-bf5a-5612303654ea/fugoxofuwokoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1f1e278-775f-41b4-a342-910ed78699cb/9705293608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ae1d3f5-e5fd-425d-960a-65614fda02fa/rabelais_and_his_world.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b20e0f3-53f5-41ff-b434-7037021ee840/59698372166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64d0e35b-cfa8-45c8-a7d8-80385fa47eed/loraf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/894d86c8-08da-4bf6-be1e-ce4de0283261/kozazozuzido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79f29e42-fbdf-456d-9291-3d8f5a9c68d6/linux_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c31a5ee3-7e7e-4739-b827-498a490ada7a/18211049285.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE062 5020 bytes
SHA-256: 4aba6334a1f6ee6945e2211c0715193cef52c7eb41570be47aa75f3bd0174f02
font_01_sfnt_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 10976 bytes
SHA-256: 0aac1da3ab544c02005c5f290ccce0c29da310247d6206e127d34de4c7d7b67d
font_02_sfnt_off00011743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11743 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2