Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f50abd10f95e48…

MALICIOUS

PDF

72.3 KB Created: 2021-04-01 10:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7614a0df25de52eec52c470af7f21d5d SHA-1: 131c2c28bf26fc9f0ba5b50d3f5423438cfef424 SHA-256: c9f50abd10f95e4808ea2163213221ffb11928cedab0890e04a93b985050d087
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/award?keyword=jurnal+ilmiah+akuntansi+manajemen+pdf PDF link annotation
    • https://vuguwawu.weebly.com/uploads/1/3/0/7/130776175/9462152.pdfIn PDF document text
    • http://koguvagad.22web.org/certificate_design_vector_free.pdfIn PDF document text
    • https://subilitukufune.weebly.com/uploads/1/3/4/6/134629352/b29238.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/9846234.pdfIn PDF document text
    • https://gaburizopa.weebly.com/uploads/1/3/1/4/131438784/6968577.pdfIn PDF document text
    • https://larezonisu.weebly.com/uploads/1/3/0/7/130738889/butoraxek.pdfIn PDF document text
    • https://bilimetib.weebly.com/uploads/1/3/4/4/134435282/3cda1483.pdfIn PDF document text
    • https://rulewosiziruzo.weebly.com/uploads/1/3/0/7/130739522/vinapexeke_xetogi_fokabosar.pdfIn PDF document text
    • https://bokosemebejira.weebly.com/uploads/1/3/0/8/130813317/3126096.pdfIn PDF document text
    • https://letavozogat.weebly.com/uploads/1/3/5/9/135978758/355e81b5ebcea7.pdfIn PDF document text
    • https://webegerux.weebly.com/uploads/1/3/4/7/134759049/dc3e46ee.pdfIn PDF document text
    • https://fuvimufuba.weebly.com/uploads/1/3/4/8/134870364/f6884cb93857dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_f6288b50fb054858b571d9b00a83b207.pdf?index=trueIn PDF document text
    • http://savekuf.rf.gd/fumanogidu.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_85df3587763249bfab81ca82533119f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/714a63d8-1c5d-4077-bfc2-7cd9b5af0101/96222220909.pdfIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_84262b8ab0bd408f879a5ba617763a34.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e4edc2a-8cb0-43ba-b4ec-f595f69d8add/what_are_the_requirements_for_a_drivers_permit_in_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd5035e9-4bce-4517-b78e-879c79c57bf5/fujotuzo.pdfIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_4938face50be440b8a8bdf13eec3c1c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a0d81c4-5baf-42d4-a145-04c9078fdd00/fundamentals_of_statistical_and_thermal_physics_reif_download.pdfIn PDF document text
    • http://kodugexibitomo.rf.gd/95297880441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58680a4e-fc0a-46b9-8b97-c4dfe652f726/metal_gear_2_solid_snake_vs_big_boss.pdfIn PDF document text
    • http://sawisumunufu.rf.gd/bar_design_plans.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_off0000df4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4E 5408 bytes
SHA-256: 83533d6eecb0168740dc5282d84cc4ac23b38ecc8b6d9a0a293271171c35fe7a
font_01_sfnt_off0000f18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18B 10028 bytes
SHA-256: b2e40a014ed94353f4990e30914f6fa10b3062ebe6ba1e2cb85f2cfe4ce3661a

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