Malicious PDF — malware analysis report

Static analysis result for SHA-256 894a63ddec535670…

MALICIOUS

PDF

75.4 KB Created: 2021-03-29 05:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3b3f68fd88ce73c3f5b2e14594d4982 SHA-1: d6a849e01537be8f64feb18c0d8aab93ce0aa452 SHA-256: 894a63ddec535670bb1758d6e847f17ae66d8977c21ab85ac3089db0dcee0e76
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common tactic for SEO manipulation or distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs suggests the primary goal is to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=al+quran+dan+sains+modern+pdf
    • http://vizionsmc.net/cazadores_de_sombras_ciudad_de_hueso_pelicula_completa_en_espaol_latino_hdmyubs.pdf
    • http://dvigatel.guru/presentation_of_intangible_assets_on_balance_sheetgmzza.pdf
    • https://cdn.sqhk.co/jebixusugak/wWgihi9/popular_hashtags_today_facebook.pdf
    • https://cdn.sqhk.co/zapevexuvot/ja9idjc/coffee_shop_3d_design.pdf
    • http://romeoplanet.club/61783785008uqobb.pdf
    • https://cdn.sqhk.co/moxinivo/gfjcifc/candied_ice_cream_parlour.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a0c6d581-b93d-4267-ab34-7e511713739e/xutodijopoxesipi.pdf
    • http://kalilom.epizy.com/cinema_4d_journey_course_free.pdf
    • https://02274cc9-8b57-4441-be19-e46c089ec46b.filesusr.com/ugd/f11b8f_4514ef4161e04326a751ea690cd31d9a.pdf?index=true
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_18111657602a42be85aae2177930feb6.pdf?index=true
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_b916013cc840458286ad9f0a52ea0124.pdf?index=true
    • https://uploads.strikinglycdn.com/files/926f022e-f14e-4022-b2bb-0a3c4b9ae4e1/gabafopilede.pdf
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_c5342e55568d4a858711264c6d37aec0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a462dc76-001f-4d6e-a4d6-ec5e2bee6dd2/59549004849.pdf
    • https://uploads.strikinglycdn.com/files/ac9aaf64-e20b-4365-8d0b-6eef4b051aad/bagobikevora.pdf
    • https://uploads.strikinglycdn.com/files/a7094a4b-36b8-4cfb-8d7e-6ac46bdde0cb/soreresomadugixovudipari.pdf
    • https://uploads.strikinglycdn.com/files/d671301b-7908-4a96-b006-8d2b7c5e25b2/64227480869.pdf
    • https://uploads.strikinglycdn.com/files/f82d7e20-6248-43b1-9a99-7618eac19f8d/what_is_the_difference_between_snmpv1_v2_and_v3.pdf
    • https://uploads.strikinglycdn.com/files/684d5cfa-41b9-4c45-8997-bd2c1a8bb985/spring_framework_certification_dumps.pdf
    • http://watokugen.epizy.com/walabixebi.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_off0000e8fa.bin
332a50b9c922b6e0db11e9bee4839584cca9ef9c6711868dcd20eda0750aee16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 5300 bytes
font_01_sfnt_off0000fae6.bin
563e0c1ef5e5dfc31cb04381ba6b7ccdbc085a0fd6991f9908d7438d2cd0f97e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE6 11124 bytes

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