Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4d66fb0d320a07…

MALICIOUS

PDF

76.1 KB Created: 2021-03-07 22:11:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8633baf3809b4e9d1dc437657ce381f7 SHA-1: 7c7ec32a228481c1f17cff61f8cb9bf6a3c634aa SHA-256: 6f4d66fb0d320a072b04138e9a55983f88cab6b7cd80180bab27e71a182a715c
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, identified as a PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically as a phishing or trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious sites, likely for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/strik?utm_term=3+tipos+de+comunicacion+verbal
    • http://zonokiwuwagupu.getenjoyment.net/how_much_do_soccer_referees_get_paid_in_south_africa.pdf
    • https://cdn.sqhk.co/muvetowiripa/gfEidje/rarod.pdf
    • https://cdn.sqhk.co/xuluriwu/QDOhche/pocket_stables_pedigree_paper_guide.pdf
    • https://cdn.sqhk.co/noxivudeva/J13hgSO/ball_thrower_for_dogs_uk.pdf
    • https://dujizozobalosu.weebly.com/uploads/1/3/4/4/134470010/rofipaxa.pdf
    • https://rurasudi.weebly.com/uploads/1/3/4/4/134485231/ab48dab05733.pdf
    • http://tesupelaj.sportsontheweb.net/best_acer_laptop_for_students_philippines.pdf
    • https://sepetumeba.weebly.com/uploads/1/3/4/6/134601334/kuloner.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3756e321-c190-4cd9-bc2d-60ac66de7b7d/56866209739.pdf
    • https://uploads.strikinglycdn.com/files/583493ff-13fc-4a00-8c3e-93032bcb889e/lujur.pdf
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_39f1fac37d3047098c5ac2e474d21bc8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f9625c41-6430-42ed-80fa-724200c4347b/nowipow.pdf
    • https://uploads.strikinglycdn.com/files/5cc61090-6eed-46c2-ae0c-ae8a692cc044/nuvadesumilefamolen.pdf
    • https://uploads.strikinglycdn.com/files/7986da4f-1922-4f78-b935-01e3eb0c7a1e/tunil.pdf
    • https://uploads.strikinglycdn.com/files/d205e9f1-a98b-4dbf-afbf-6362b787fdc9/26064043345.pdf
    • https://uploads.strikinglycdn.com/files/f1cc7a79-6590-4f32-ae1a-f2c3ca7fe6e2/dongri_to_dubai.pdf
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_47dae3722b4c47448c392343fe2e0d36.pdf?index=true
    • http://wutejaxevewef.myartsonline.com/can_you_keep_a_secret_lyrics.pdf
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_a101139bbc0c4010a7e98620cfe9ef29.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5b51eb46-909c-4664-a5b2-45e8c78f4519/sat_words_meaning.pdf
    • https://uploads.strikinglycdn.com/files/dd39ed22-b15d-44c2-b1d0-4ce2fe739203/intermatic_dt620_timer_programming.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_off0000ea6f.bin
0ec9ba4691f800c292d72c8491dc4b9d837fd4680cbf8c7e8763b390df89defe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6F 5488 bytes
font_01_sfnt_off0000fd01.bin
521737ea470000c01094e570c99141b2c2a8f709f46e9595737caa53c1a628ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD01 11388 bytes

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