Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55feb44dab8c12c…

MALICIOUS

PDF

81.8 KB Created: 2021-03-27 15:30:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d744f67a70aefcb5acdeb58586c6ea97 SHA-1: 158bc0c1f7b8104e9fa285c3b31282e434512c78 SHA-256: c55feb44dab8c12cc6f599c11c798f252d13a8e39da028495bf3be448faafc35
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/123?utm_term=car+insurance+certificate+template+uk PDF link annotation
    • http://fowunajokofow.iblogger.org/sekuguma.pdfIn PDF document text
    • http://soldatskaya6.ru/when_can_a_child_draw_a_face827eh.pdfIn PDF document text
    • https://bizitaninajoki.weebly.com/uploads/1/3/5/3/135316521/8737372.pdfIn PDF document text
    • http://1xbet-registr.site/difference_between_conduction_convection_and_radiationhv75v.pdfIn PDF document text
    • http://milansit.space/kotagazimironipanexobizewkq171.pdfIn PDF document text
    • https://tedajurilazunu.weebly.com/uploads/1/3/0/7/130739962/naledoxofegudu_zalijijobex_tusuvo.pdfIn PDF document text
    • http://sarepoxorak.22web.org/star_wars_imperial_handbook_a_commanders_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_b24520a80b5447b98dcfa0196b875420.pdf?index=trueIn PDF document text
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_a68b562601b24854a284f6eef4461f9c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/organelle_synth_manual.pdfIn PDF document text
    • https://e6a48395-9ebc-465e-8505-c4b20d7b8e72.filesusr.com/ugd/81e12b_ef93762e91814093a0e84eb2a6223e02.pdf?index=trueIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_2b06fd5294174ea4ad047fd9339bca82.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/litunux/68508918921.pdfIn PDF document text
    • https://4c8cc264-4606-483b-a6fd-3ab48ba5c15a.filesusr.com/ugd/c626f4_b51258b498f3480892eb9a9d68320c1e.pdf?index=trueIn PDF document text
    • http://jekoradamotud.epizy.com/98909643381.pdfIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_b64ee68dd9354f26ab8b9aa1532bc775.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/17277819545.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/nifedovarogafalefu.pdfIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_b4f8dcb4899b4354a9acaef04ec6a62e.pdf?index=trueIn PDF document text
    • http://vasevun.rf.gd/41675255200.pdfIn PDF document text
    • http://kegaregajisojas.rf.gd/articles_a_an_the_test.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/the_leftovers_book_review.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_off0001040b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040B 5132 bytes
SHA-256: bf7a491b3e9b77c75615086f237ef60e40dbd1778936c2d15f23193a49b356c0
font_01_sfnt_off00011568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11568 10668 bytes
SHA-256: b2e5be6200ca4eabf6e9666bd1f42989f39e132e49ad4b748875de24fd260d3f

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