Malicious PDF — malware analysis report

Static analysis result for SHA-256 98babaca6607ae4f…

MALICIOUS

PDF

121.3 KB Created: 2021-03-21 07:58:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6aef3a35a811074febfa639921c441a4 SHA-1: b630bfb62d5abf610297e501aac95c744fecccf5 SHA-256: 98babaca6607ae4f8084badd2738be072b81034ca1be2389c6d70ca14b8f28c8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document's content, disguised as educational material, is a common lure for such attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://resalured.ru/wix?keyword=chemistry+%25E2%2580%2593+unit+5+molecular+structure
    • http://losinglotterynumbers.com/bmobile_online_balancem9v2n.pdf
    • http://1yamal.space/naxokudoxuwakeloapnj2.pdf
    • http://lupelisizi.medianewsonline.com/lurazawasu.pdf
    • http://nalodorepuwag.getenjoyment.net/teoria_da_aprendizagem_cognitiva.pdf
    • http://vepapin.iblogger.org/metro_2033_last_light_redux_review.pdf
    • https://cdn.sqhk.co/kisoxukapab/cYgdtIb/90_s_pop_music_trivia.pdf
    • http://najisemure.medianewsonline.com/72943545860.pdf
    • http://siwivelijutore.medianewsonline.com/ccna_voice_manual.pdf
    • https://cdn.sqhk.co/niripakexad/TccjaIp/perfect_gear_tuning_for_offroad_outlaws.pdf
    • http://securityverifiedservices.com/96897344569r3mto.pdf
    • https://cdn.sqhk.co/vivakawibaki/bBgjiaz/42757599697.pdf
    • https://cdn.sqhk.co/wimiwupo/wjiPMjn/22934246233.pdf
    • http://wewofif.scienceontheweb.net/piwavarexupadifatu.pdf
    • http://dipurenirexo.22web.org/xokawowerofenut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_72eff2c9c4d44823939f28dc0da6facc.pdf?index=true
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_109f7a6fb0a14f48b04d1b863432cfb1.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000181c1.bin
779b236bc6722812f700dd4535b0745bddaa47619fd1d8d37d71ec9912c41d4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x181C1 5200 bytes
font_01_sfnt_off00019357.bin
15645a448f0ffd7e76947906e23ffdbfb90b71507048db877188557ebf901786		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19357 13476 bytes
font_02_sfnt_off0001c093.bin
513236b56cd24d18f1916a542380e1656fe596eca6e14df5516133ff488da9f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C093 16100 bytes

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