Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b05111cf3459f68…

MALICIOUS

PDF

75.8 KB Created: 2021-03-10 08:32:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e370790dfeedfea2b1cc35ff3d7fdda5 SHA-1: 1075fd15387f9ae91084ada4f92ca13cb5f9f6e5 SHA-256: 7b05111cf3459f686e85d93470873c7622df1fa4b1478c6c3b4760edd65d0acc
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM' that hosts a large number of PDF links, suggesting a tactic to drive traffic to potentially malicious sites. The embedded URLs point to various domains, some of which are associated with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/award?keyword=antrenmanlarla+matematik+1.+kitap+%25C3%25A7%25C3%25B6z%25C3%25BCmleri+pdf
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/363919.pdf
    • http://xawegap.mywebcommunity.org/how_to_become_a_good_husband.pdf
    • https://cdn-cms.f-static.net/uploads/4417664/normal_6040b227467cb.pdf
    • https://juzudibat.weebly.com/uploads/1/3/4/3/134328144/javivajolewiwal.pdf
    • https://cdn-cms.f-static.net/uploads/4460686/normal_60102c048433f.pdf
    • https://xizadububexo.weebly.com/uploads/1/3/4/5/134595199/nidesuman-bewud-lijafur.pdf
    • http://zawugudumi.getenjoyment.net/rupirufofilegemijuw.pdf
    • https://xazalonabi.weebly.com/uploads/1/3/6/0/136086847/bazuguxepeposizitizu.pdf
    • https://libexezelidod.weebly.com/uploads/1/3/1/4/131454359/fenepujafupude_vogake_vuvijufo.pdf
    • https://static.s123-cdn-static.com/uploads/4370064/normal_5ff6b83a428a7.pdf
    • https://semufukat.weebly.com/uploads/1/3/1/8/131857602/xeganulidapoxisuzo.pdf
    • https://cdn-cms.f-static.net/uploads/4379032/normal_601eed13bc548.pdf
    • https://cdn-cms.f-static.net/uploads/4393916/normal_6026697a89849.pdf
    • http://bikuribowe.22web.org/dirio_ntimo_lima_barreto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gelapuduwo.epizy.com/rixunonujavuvelal.pdf
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_6d17ec40126646c7b218d51c10020a3b.pdf?index=true
    • http://jibimom.myartsonline.com/mathematics_teacher_s_guide_grade_8.pdf
    • http://pigafutuvip.rf.gd/58137925157.pdf
    • http://perexuwofogefo.onlinewebshop.net/how_much_is_david_murphey_worth_from_90_day_fiance_net.pdf
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_6ccdd41817d948118d46390a394bc80c.pdf?index=true
    • http://famutiparuzot.epizy.com/5428000421.pdf
    • http://jezevenakos.myartsonline.com/percy_jackson_and_the_olympians_book_2_audiobook.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_off0000e955.bin
3026fb830400ca8fabae0db4cd7af95d9a65db3bbf7e0a247f35e4d03642aec6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 5636 bytes
font_01_sfnt_off0000fbf9.bin
a04273884663566d9c206dc682860b0c9fabc6886a72e970a3dc4120f4b8c3a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF9 11028 bytes

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