Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fe6cc748af8c75…

MALICIOUS

PDF

84.7 KB Created: 2021-03-22 04:04:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe180cf55e9258b32f723c9a6aca9e28 SHA-1: 4af3993db3ef7cb92bbc368a09c02089855db347 SHA-256: 41fe6cc748af8c75939b07f1dad4622b5ad0f68cf5f3d064ce7f3fbbcecfb00e
164 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a large number of external PDF links, suggesting a link farm or distribution mechanism. The ML classifier and ClamAV also identified it as malicious. While the document body mentions 'wild animals information', the primary malicious activity appears to be the mass generation of external links, likely to host or redirect to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kuzutuzo.ru/award?keyword=wild+animals+information+with+pictures+pdf
    • http://vadememejunozax.iblogger.org/free_vector_art.pdf
    • https://simisasokudu.weebly.com/uploads/1/3/4/2/134235492/zotikeretugalovozat.pdf
    • https://lekixusa.weebly.com/uploads/1/3/0/7/130776254/335001.pdf
    • http://lofokumado.22web.org/interesting_facts_quiz_questions_and_answers.pdf
    • https://kijabejinal.weebly.com/uploads/1/3/0/9/130969506/3651182.pdf
    • https://radotarurejatu.weebly.com/uploads/1/3/1/6/131607565/8917725.pdf
    • https://wububored.weebly.com/uploads/1/3/4/0/134042895/2374995.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xotepugiz.rf.gd/demon_hunter_leveling_guide_wowhead.pdf
    • http://repujatadaw.rf.gd/independent_clause_subordinate_clause_worksheet.pdf
    • http://vusatalejud.epizy.com/which_personality_type_is_the_most_rare.pdf
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_5f75c08c6bbf4f179be9f2b5311ce551.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dff6dcb8-f1ad-4369-9069-558519d28bf2/rilupetomesazad.pdf
    • https://a0f1d9c0-ea46-4e0e-9383-d87711d3127f.filesusr.com/ugd/1e3fb7_744dd0ab5b094f028630c55ba70c794a.pdf?index=true
    • http://zikenonuto.epizy.com/32841659928.pdf
    • https://uploads.strikinglycdn.com/files/286d3192-1f06-487f-ad63-f95707ed0175/qcy_t1c_review_reddit.pdf
    • https://s3.amazonaws.com/laginekux/leider_wurde_austauschdienste_beendet_android.pdf
    • https://s3.amazonaws.com/gofiguj/microsoft_visual_c_2015_redistributable_x64_error.pdf
    • https://s3.amazonaws.com/rubidokezive/amgen_canada_medical_information.pdf
    • http://nadadeze.epizy.com/suwasivosifejemisabot.pdf
    • https://s3.amazonaws.com/bidemewufa/what_is_the_length_of_a_football_pitch_in_meters.pdf
    • https://s3.amazonaws.com/takateg/napavolivorupekiv.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_off000109f9.bin
7dacf66f0095b225c312dc9414940d688ae6ba9dc31983e22dec4765466fa786		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F9 5500 bytes
font_01_sfnt_off00011c9e.bin
106c5613e3cd74a71c6c40c9a785831d334cb001219e3043178a950d3bf5cdf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9E 11352 bytes

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