Malicious PDF — malware analysis report

Static analysis result for SHA-256 d661171d9fab7582…

MALICIOUS

PDF

77.0 KB Created: 2021-02-11 01:16:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fe19a084e2e6c766cf8dc14f81a24323 SHA-1: 0f7a253102120cb9019f6a3fd4d2f102c96b10c0 SHA-256: d661171d9fab758297179d32a86e77507b89466b760c9ab838a7b04ac0ae842a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The primary malicious URL identified is https://seumenha.ru/wb?keyword=abhimanyudu%20telugu%20movie%20%20720p, which is likely part of a link farm or phishing campaign. ClamAV also detected this file as Pdf.Phishing.Trojan, further supporting its malicious nature.

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
  • 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.
  • 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://seumenha.ru/wb?keyword=abhimanyudu%20telugu%20movie%20%20720p PDF link annotation
    • http://tuworiki.22web.org/firefox_quantum_free_manager.pdfIn PDF document text
    • http://zobebukore.22web.org/10777291652.pdfIn PDF document text
    • https://bewanabexujafo.weebly.com/uploads/1/3/6/0/136050633/84d440.pdfIn PDF document text
    • http://xoridamewok.iblogger.org/vizaxa.pdfIn PDF document text
    • http://kuxakedu.iblogger.org/49336499594.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://s3.amazonaws.com/vavabi/how_to_format_basis_points_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/lubaxugenepigufuka.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/97370796975.pdfIn PDF document text
    • http://lisodibediv.epizy.com/identifying_similes_and_metaphors_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/former_cardinal_defrocked.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/second_grade_synonyms_and_antonyms_worksheets.pdfIn PDF document text
    • http://lofupiwosilabo.epizy.com/amharic_music_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/vusenulixepagolilowufame.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/86246803679.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/alternative_splicing_mrna.pdfIn PDF document text
    • http://luniwopekesoto.rf.gd/lafurusogez.pdfIn PDF document text
    • http://zabamaxe.rf.gd/lefovozo.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_off0000dff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF2 5628 bytes
SHA-256: b5c0bc306a37efa89a9259b1ca298d010fffaee887075cd6f777b4da028ea5df
font_01_sfnt_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 11484 bytes
SHA-256: ebeb8d57cde82ceb1d023c664b9d7cc590105f719bacaaddf5939f10e3f5dbed
font_02_sfnt_off0001191e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191E 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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