Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c4c1153b56d857…

MALICIOUS

PDF

75.0 KB Created: 2021-03-14 13:46:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c3d21d4c52d13edf47907bcce70be8a SHA-1: 18dd86a8ab97e5f3273f2dc58e0142e390f698c2 SHA-256: 09c4c1153b56d8574a98cfd4e1b9087641b0dd463d42c3a5ae44a9010fcc58d5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It contains a large number of external links, characteristic of a link farm designed to manipulate search engine rankings or direct users to malicious sites. The primary malicious URL identified is https://vilenefex.ru/wix?keyword=mara+jade+sith, which is likely used to distribute further payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/wix?keyword=mara+jade+sith
    • http://sungo1.space/mararevobaj1cbf7.pdf
    • https://buzalunila.weebly.com/uploads/1/3/1/6/131606025/vexetamif_kaxos_vixolo_bujok.pdf
    • http://gradstroy.su/solo_una_cosa_gary_keller76a8x.pdf
    • http://trastenmyqort.online/314586609239tzsc.pdf
    • http://dostafood.xyz/fizapewepirediwagaljqza5.pdf
    • https://detitominaxa.weebly.com/uploads/1/3/5/3/135304018/9307090.pdf
    • http://tasunixupowife.66ghz.com/meretufilev.pdf
    • http://dumubemajizukov.medianewsonline.com/32161417478.pdf
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/5442056.pdf
    • http://duxuzibeb.22web.org/43242935819.pdf
    • http://talajudoxuxip.mygamesonline.org/38931154474.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/divelatoxa/61752677939.pdf
    • http://malukofe.rf.gd/consumer_reports_black_friday_tv_deals.pdf
    • http://wupidusujimi.myartsonline.com/turebipetunitilofepomur.pdf
    • https://s3.amazonaws.com/widuxade/atharva_veda_in_gujarati_free.pdf
    • https://s3.amazonaws.com/xuzed/diary_of_a_wimpy_kid_long_haul_full_movie_watch_online_free.pdf
    • https://s3.amazonaws.com/vosimalume/degowaxovujawesep.pdf
    • http://ziduwor.epizy.com/bihar_police_sub_inspector_book.pdf
    • https://s3.amazonaws.com/zusevamasor/mujizidezetikorevixorufi.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_off0000ea67.bin
3440faa6758e170d138aeb1eb6f520a1f0005bef823d1f91573baf1332845169		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 4964 bytes
font_01_sfnt_off0000fb4e.bin
8234bc770463317bea050d79a169eab9400baa200b48d009a04498d86ab4f539		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4E 10768 bytes

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