Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d25cb0cf866396…

MALICIOUS

PDF

92.7 KB Created: 2021-04-04 03:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5863df5557d0b35baee958e1d7758bd5 SHA-1: cd99172970cfd477e9003f1a9917986152f48113 SHA-256: b9d25cb0cf866396682a7bfba91a8f934702899df6436a68b438535c4e172b5d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm intended to drive traffic to malicious or phishing sites. The primary URL, 'https://soxebez.ru/award?keyword=cattell+s+16+personality+factors+pdf', is presented as a search result, likely a lure to a phishing or malware distribution page. No scripts were extracted, but the PDF structure and numerous external links strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/award?keyword=cattell+s+16+personality+factors+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369776/normal_6021a6cba9d38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413705/normal_6005743aabe94.pdfIn PDF document text
    • https://wadasazaba.weebly.com/uploads/1/3/3/9/133999184/5467958.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369507/normal_5ff2222448c3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466154/normal_602f13555c9f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418788/normal_603fcf9046afa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380380/normal_6004cfc21134d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527164/normal_6064f75ae67b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483836/normal_5fee3fee4ae03.pdfIn PDF document text
    • https://lijepaxo.weebly.com/uploads/1/3/5/3/135324298/78ff44b9786.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbc11b56-454a-4a4e-abd0-dbf9857e2cae/83423246550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b43cb617-c28e-4123-a69a-d531295a1216/87810378910.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e89f46c3-cd53-470c-9488-b30a27c0798c/2012_hyundai_sonata_hybrid_engine_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ff7d615-4c99-4229-b91f-37e6ad620588/dosivubopix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a65252f-a42b-417b-8a92-924726604d29/45153991243.pdfIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_499f1793d62f4d649db9626f92c77541.pdf?index=trueIn PDF document text
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_0fd56aedc16d4a11863dad4edda520aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/092ab885-4bc7-4eed-87d6-7386506b00b0/the_wrath_and_the_dawn_webtoon_ending.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a6dd018-1bda-4ec2-91eb-cc506ee5264c/glencoe_algebra_1_7-1_skills_practice_multiplication_properties_of_exponents.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DE 5364 bytes
SHA-256: dd0e96751f9b050da03c0499337b8e845aff9ab2ab3d1f569f755a5862817361
font_01_sfnt_off00012b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B34 10604 bytes
SHA-256: 508d5fe25538cb44d994724ed68c02dfdc51496bbfa743b13ffe94a171352ab8
font_02_sfnt_off00014f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F72 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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