Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43a12085853eec5…

MALICIOUS

PDF

86.0 KB Created: 2021-05-23 02:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 045f17e4d62418a2065d0dd48d742a5b SHA-1: 27d867607a97e29107976307ec32a74e46a3d7df SHA-256: d43a12085853eec5c2ba3cb992e9d9819d6dad4e291a1874815acaefb2cadc24
214 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external resources, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://dafemum.ru/strik?utm_term=bhu+bsc+nursing+entrance+exam+question+paper+pdf, which is flagged as a malicious redirector. The document's structure and the presence of numerous links indicate an attempt to direct users to potentially harmful content under the guise of educational material.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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=bhu+bsc+nursing+entrance+exam+question+paper+pdf In PDF document text
    • https://tateleref.weebly.com/uploads/1/3/5/3/135322569/waxasebevako-letep-sogazojefuwigi.pdfIn PDF document text
    • https://xibatelilon.weebly.com/uploads/1/3/1/6/131637149/3846456ff95c.pdfIn PDF document text
    • https://nilelaji.weebly.com/uploads/1/3/0/7/130775665/basakije-bigasuk.pdfIn PDF document text
    • https://kifirazet.weebly.com/uploads/1/3/4/7/134715796/e8c7a.pdfIn PDF document text
    • https://xewidepomizexas.weebly.com/uploads/1/3/0/7/130775014/mugope.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/crackle_apk_para_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e150fd2b-a09f-4713-9ad7-88f028ee2f2d/31386070642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68c4f3e7-62cf-4367-816a-986b59713773/how_to_program_directv_universal_remote_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/pewebowabutavuvukiwamap.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/lucky_in_love_book_parents_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e33b3e6-b8a9-4737-ad77-8430f99939fd/zevapabejota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6cc7b0d-6161-44e1-970b-da8cc244416b/vawawakidobosop.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/colourpop_super_shock_cheek_between_the_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/nakagonotamowawupagipul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5018eeac-3305-45ec-a7cc-e4cb1d78b726/chamberlain_model_wd962kev.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/42772349016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04d91377-80e3-4bd0-a92b-0776cf0e9ce2/vinarizod.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_off00010ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFE 5920 bytes
SHA-256: d0913234ea7f6ef74890b46cfc09446980cf58a6aae95ba72ac10f47c5d3628e
font_01_sfnt_off000123fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FC 11460 bytes
SHA-256: 6ec629246f66bb6952b60a46e71ef4dd6e82aa201615af3057395b47e4034dc9

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