Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51e05ded5d0404e…

MALICIOUS

PDF

111.2 KB Created: 2021-03-15 19:44:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b705ba3ff96e1766f973a8e15262abfb SHA-1: 68af177638f1337392467486a7529d0d0a5a1591 SHA-256: c51e05ded5d0404ea17dbed877b0324629e324e54baaa6ffdf94ef47069e087b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, suggesting it is designed to redirect users to potentially malicious sites. The ML_NYX_PDF_MALICIOUS and ClamAV detections confirm its malicious nature. The embedded URLs are likely used to distribute further payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://botokaw.ru/award?keyword=arabic+worksheets+for+grade+5+pdf PDF link annotation
    • https://wikuxokogex.weebly.com/uploads/1/3/1/8/131872144/3029095.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/a3dfb74b2112000.pdfIn PDF document text
    • http://fiziwafofekaku.mygamesonline.org/mabak.pdfIn PDF document text
    • http://zezasarasojid.mywebcommunity.org/wijolutono.pdfIn PDF document text
    • http://kevakigev.medianewsonline.com/fitbit_flex_2_3_pack_bands.pdfIn PDF document text
    • http://nidewopovuwubo.mypressonline.com/43897321317.pdfIn PDF document text
    • https://safuziketuxoxu.weebly.com/uploads/1/3/0/8/130814855/bodiwajamoxivuvo.pdfIn PDF document text
    • https://bupudotededifo.weebly.com/uploads/1/3/5/3/135323991/7f624c9533d001.pdfIn PDF document text
    • http://waduresiwiboba.iblogger.org/maplestory_broken_link.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wowarawepikoxa.rf.gd/lerimekilafa.pdfIn PDF document text
    • https://dd39d194-9042-494f-90ab-223c96cf8da5.filesusr.com/ugd/5d3909_946f1fb44c8a40db8e91f4c2cfc6a9a1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/guajiras_de_lucia_sheet_music.pdfIn PDF document text
    • http://wevisoxa.epizy.com/batman_comics_online_in_order.pdfIn PDF document text
    • http://fejiremow.epizy.com/format_sql_server_query_shortcut.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/casos_de_uso_ejemplos.pdfIn PDF document text
    • http://rekekolulopar.rf.gd/31088789883.pdfIn PDF document text
    • http://jefesati.rf.gd/bcg_matrix_template.pdfIn PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_f99cba16c4814b91a1abc62a52e37b15.pdf?index=trueIn PDF document text
    • http://falalovoxiwada.epizy.com/construction_business_plan_south_africa.pdfIn PDF document text
    • http://tipokeviti.atwebpages.com/pebemodufomowenonejapekef.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/folewutusi.pdfIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_c9d801ab08ee462f92882a4ce7e77096.pdf?index=trueIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_2463a9ec4180424b9715bfc716ef34e2.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00016a11.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16A11 29308 bytes
SHA-256: 9e91392ac44f55c5756ea5a9b178deadf2f0747e4a39a4d192aafe84139eacf9
font_00_sfnt_off0001271a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271A 5476 bytes
SHA-256: 2d33bb065bb48b0fb67a9990f579fddb27ef06a2a01cfe2ae8b3016b294095e7
font_01_sfnt_off000139d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D6 1552 bytes
SHA-256: 31dd75c2b07eaf280ebef25cbfd6878025deda0bb68641426687c612141191cc
font_02_sfnt_off000141d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D9 11816 bytes
SHA-256: 82e8a05d430847ddf5d79bd86fd39ea3b37c5be91403b9bf0c120db219f77f83
font_04_sfnt_off00019e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E56 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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