Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9424a363bdb17e7…

MALICIOUS

PDF

112.9 KB Created: 2021-05-02 00:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b9cd228d0823bb9267f764d49a49d787 SHA-1: 46bc885d6af32231fd2d248b942cd366adc09514 SHA-256: b9424a363bdb17e72a672461f77a00f7ca7ba209124ce8f49edf577d6cabda6e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, pointing to a potential phishing or malware distribution scheme. The primary malicious URL identified is https://vilenefex.ru/strik?utm_term=the+natural+cast.

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://vilenefex.ru/strik?utm_term=the+natural+cast PDF link annotation
    • http://sipivide.iblogger.org/head_first_java_latest_edition_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_e21a17e4bbd741d8a6e1e9b3a0e747d6.pdf?index=trueIn PDF document text
    • http://pilomewolax.epizy.com/nokexam.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/96284876868.pdfIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_599dbb9ec48447c2a7b458c2e8b6ad05.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5545d55e-cee1-43e7-9989-bdc9a50aa351/vujajubovibosujiduriduxo.pdfIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_8def7f21da04408da406b8df62b2fd1f.pdf?index=trueIn PDF document text
    • https://16dc6c2a-32e3-4a69-9eea-5b59d93654f8.filesusr.com/ugd/176c29_dd631bb406e84cda8c5a1ea4458eac2c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0e452b8-6237-4372-9248-47501a110036/how_to_make_a_log_splitter.pdfIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_5a5ef9385bda4fc0ab66350c02dca971.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezorito/kojegilurikagosuno.pdfIn PDF document text
    • https://9462281c-6212-45c1-8f90-c4e3c363a226.filesusr.com/ugd/007d40_03134d7f78354eb29ccee6d1953abeb1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gomaxod/argument_fallacies.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/can_you_look_up_a_child_support_order_online.pdfIn PDF document text
    • https://b724dda4-e2e0-47c5-811c-ae3b7273578b.filesusr.com/ugd/a1e5ee_e2deb2b2d8c142ddb31972cc5aec56ef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/pugabuxuruvativosegin.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_8987b0e9a81846a5806d397559df8c08.pdf?index=trueIn PDF document text
    • http://noborixujap.epizy.com/62196330883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa16c7d8-db82-4f2e-b31b-3ff1c217f4c4/58608380449.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_off00017b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B76 4836 bytes
SHA-256: b9afe4eb96c3a04108c8982569787bf5b7e8d63e059a59c8fd135c1eff776cf8
font_01_sfnt_off00018bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BD7 12660 bytes
SHA-256: 6818787c1bbaa58dd98a09a55c20e325008d602341cb2ddf96269790f57ce4b1

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