Malicious PDF — malware analysis report

Static analysis result for SHA-256 8713089df2926d6a…

MALICIOUS

PDF

97.5 KB Created: 2021-03-29 10:38:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38def5139883a4f4a31665c09d3e3b73 SHA-1: a929c7bb6213790777f18e7cae2eed37ff4cc0ae SHA-256: 8713089df2926d6a7b7e4b802882a4193ac8a5cad73a37974368fbdbc9b1b11f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'link farm' intended for SEO manipulation. The presence of a malicious ClamAV signature and a high ML classifier score indicate malicious intent. The embedded URL points to a site related to 'minecraft corpse mod 1.14', suggesting a lure to attract users to a potentially malicious website.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=minecraft+corpse+mod+1.14
    • https://cdn-cms.f-static.net/uploads/4417998/normal_600dffb611d0b.pdf
    • https://cdn-cms.f-static.net/uploads/4370744/normal_5fd6351794119.pdf
    • https://mafugefowodofo.weebly.com/uploads/1/3/1/3/131378796/risewi_rovejof_sunijogepifupom_nefokijeliza.pdf
    • https://cdn-cms.f-static.net/uploads/4496616/normal_5fd7901456ce8.pdf
    • https://cdn-cms.f-static.net/uploads/4457838/normal_601db91356441.pdf
    • https://cdn-cms.f-static.net/uploads/4476783/normal_604fcf2c6c2b8.pdf
    • https://cdn-cms.f-static.net/uploads/4461245/normal_5fd9176e55236.pdf
    • https://cdn-cms.f-static.net/uploads/4420454/normal_603f602842333.pdf
    • https://cdn-cms.f-static.net/uploads/4474176/normal_5fd18ddedf577.pdf
    • https://safesawugu.weebly.com/uploads/1/3/2/8/132814337/nirobubidu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/verirejon/compound_adjectives_esl_worksheets.pdf
    • https://s3.amazonaws.com/pazovugal/baby_shower_invitation_templates_photoshop.pdf
    • https://s3.amazonaws.com/rizezobabub/37734369026.pdf
    • https://s3.amazonaws.com/gotijejaj/safolotidagodin.pdf
    • http://korimevolap.rf.gd/71056833597.pdf
    • http://nanesipub.rf.gd/avanzabus_app_android.pdf
    • https://s3.amazonaws.com/rodiligarexo/quantidade_permitida_de_coliformes_fecais_na_gua.pdf
    • https://s3.amazonaws.com/tobito/esc_guidelines_pericarditis_treatment.pdf
    • https://s3.amazonaws.com/vixuwogetiv/xutitadub.pdf
    • http://wemosoxa.rf.gd/champ_bengali_song_mr_jatt.pdf
    • https://s3.amazonaws.com/xovekolamoxe/tobut.pdf
    • http://pidawuz.epizy.com/35096063810.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_off00013ef2.bin
97782b8ebcc97f59347fcdf7c732f1c769d20678c6ff31bc9e92ab8484eec709		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF2 5444 bytes
font_01_sfnt_off0001517d.bin
7c879de12c811dc5f614e803d8c95220a290f7cd2f1e59d6b84aed090f0a2e70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1517D 11748 bytes

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