Malicious PDF — malware analysis report

Static analysis result for SHA-256 c896ab400ddfff78…

MALICIOUS

PDF

88.3 KB Created: 2021-03-22 21:10:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b3765855c145afb34fce87321b7d8e48 SHA-1: 7faacabc612099cb697ec8e88f06d3cdc195199e SHA-256: c896ab400ddfff78ed3d7e2631a01cd5dd3a1685abdcfec559fc0120abb69360
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains a URL that mimics a search query, likely to trick users into clicking through to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://seumenha.ru/strik?utm_term=whats+the+best+macro+ratio+for+ectomorph PDF link annotation
    • http://jijagigipijum.iblogger.org/apprendre_le_portugais_du_portugal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476567/normal_6030232a78ed9.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/Ewihvhb/neriputegopodoloxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411231/normal_605400e3eade7.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuzobisu/0hh0U2p/falling_in_reverse_lyrics_eden.pdfIn PDF document text
    • https://cdn.sqhk.co/motulobugaji/ihDFvic/86172621098.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwasusul/Qjagjhh/javutad.pdfIn PDF document text
    • https://cdn.sqhk.co/zafilivopupu/jcgjOkl/11481381774.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486221/normal_5fc9e7ab8ac36.pdfIn PDF document text
    • https://cdn.sqhk.co/fezavomol/gdigvgg/brimming_meaning_in_punjabi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369907/normal_5fce2901cef1e.pdfIn PDF document text
    • https://cdn.sqhk.co/selodiro/jeYA1ia/abdomen_anatomy_mcqs.pdfIn PDF document text
    • https://cdn.sqhk.co/rotonoba/igqxchi/39344157115.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwifemi/gcH2fii/galaxy_attack_alien_shooter_online_generator.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pinezininefos.epizy.com/date_format_r.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d39ca1c0-0b11-4f56-8c99-d7f32022a463/vinomidosawifugusevukif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42272838-1d00-4d35-be88-1cdf217285af/how_do_i_test_my_hot_tub_control_panel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ff2a012-c335-4ecb-9a0f-fe4ab954ceee/87831946803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfb0044a-9bbe-424b-bc27-3af97ca34445/19144020210.pdfIn PDF document text
    • http://lesuketel.rf.gd/35919069362.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/zaduverewexe.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/salvaguardar_definicion_informatica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44dad880-6e5b-47dd-869e-1fd56ba72973/golizudigunawudaza.pdfIn PDF document text
    • http://xofapubumifi.epizy.com/dibujos_de_cabezas_de_caballos_para_colorear.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_off0001194d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194D 5376 bytes
SHA-256: 4878431cac78d0b6cf89707a4185ac251da7ff7eac80d6a6355f3c1c38fb93e6
font_01_sfnt_off00012b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B75 11228 bytes
SHA-256: 822991e75879e61f59e6d9728e87bfa32a3843e632634308b85e10ebbbd75272

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