Malicious PDF — malware analysis report

Static analysis result for SHA-256 08cf88f6187063d0…

MALICIOUS

PDF

88.5 KB Created: 2021-04-30 21:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0510cd8069d77da7f83c7e6bcffb6770 SHA-1: acfa1c2d99276017b85b33bb2b75e1d6f89ade5a SHA-256: 08cf88f6187063d00b59c9798dfa00b3b55bf575424a66289044b7d8cbb26221
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=how+much+does+a+lawyer+cost+in+canada
    • https://sivabukejiwija.weebly.com/uploads/1/3/4/4/134459056/danesun.pdf
    • https://rigavedisibabaz.weebly.com/uploads/1/3/4/9/134902328/xonedenupi_xiwetana.pdf
    • https://bunosurazolenej.weebly.com/uploads/1/3/4/3/134331771/tolinazovubenine.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_41847c7f32c94af48bf4dbeb83ad7ce8.pdf?index=true
    • https://s3.amazonaws.com/mipeboro/zedagoferosalosez.pdf
    • http://pudopiderevunuk.epizy.com/pasovukugida.pdf
    • https://uploads.strikinglycdn.com/files/1303c01f-0f95-4be5-b6b9-5231e2552be1/pabomez.pdf
    • https://c5c1e25b-3ca9-4f8f-aecb-0ee3b29cb37b.filesusr.com/ugd/f4fe7b_6581d5e6df97458db7afd3135a77dd12.pdf?index=true
    • https://b1f0a730-f0e4-4bcf-918d-a915077b90d0.filesusr.com/ugd/a7c69d_56e909ae10774553a85044f1fca992da.pdf?index=true
    • https://s3.amazonaws.com/jobavo/asus_transformer_t100ta_drivers_windows_8.pdf
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_9cc5544cbb924e60b1cffc7f03fb95b6.pdf?index=true
    • https://s3.amazonaws.com/zazelujeju/88383559136.pdf
    • http://beminelo.rf.gd/mufenarizasisoronobivob.pdf
    • https://uploads.strikinglycdn.com/files/221b1c10-2674-4158-9c01-3b110b3027f9/govalupugodopeku.pdf
    • https://uploads.strikinglycdn.com/files/839e9070-7b4d-4092-883f-cd51e501a514/31797684625.pdf
    • https://s3.amazonaws.com/sakaburepagase/formacion_de_radicales_libres_en_el_cuerpo.pdf
    • https://s3.amazonaws.com/bubisifapagefe/bootstrap_4_classes_list.pdf
    • http://sipegevowuvuk.epizy.com/asc_606_pwc.pdf
    • https://5610d23c-e099-485d-ada5-1c5fec8f01b3.filesusr.com/ugd/97e063_a5b96a1c09df463da9a086cd424373e6.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118f0.bin
a79385357ee1f5a92008aa1da9040a015e1d52b165e8de69933f69d3eee31025		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118F0 5336 bytes
font_01_sfnt_off00012afa.bin
474d1faccf4b5fc8a9cd7ead60b6ec1bc49b2caf45bae92dbb22d13f16873942		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFA 11772 bytes

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