Malicious PDF — malware analysis report

Static analysis result for SHA-256 425c8a7c9d3f5a95…

MALICIOUS

PDF

73.7 KB Created: 2021-02-19 20:11:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0346f2f0789eff7f37c99a737e6e1939 SHA-1: d337dbbba0fc38b6e3884c93e58af160a37f4031 SHA-256: 425c8a7c9d3f5a958e21310515c014869e0595eab9b85a549ef82dc4b7a8ae9d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as search results for academic topics. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/strik?utm_term=distance+displacement+speed+velocity+acceleration+formula PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369334/normal_5fd61e5827503.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449771/normal_5fce60d395372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501501/normal_6013ca631445e.pdfIn PDF document text
    • https://luvemolovod.weebly.com/uploads/1/3/4/3/134305721/pulanegaraf.pdfIn PDF document text
    • http://sutiwejepeb.22web.org/what_functions_do_the_left_side_of_the_brain_control.pdfIn PDF document text
    • http://svoydvalend.xyz/what_foods_lots_of_caloriesf2dcn.pdfIn PDF document text
    • https://vinipuzi.weebly.com/uploads/1/3/0/7/130776781/pilipamajod_japup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484356/normal_60170867c7b22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421787/normal_602e2b03ed103.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/9060895.pdfIn PDF document text
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/ziduwutivutakurekin.pdfIn PDF document text
    • https://bijejumutitin.weebly.com/uploads/1/3/1/4/131454352/d0263f65bcd096.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vavazewesepato.epizy.com/janipekatiwamiv.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/57095401053.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/zagijodumadupafijedi.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/munozi.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/geometry_wars_3_ps_vita_trophy_guide.pdfIn PDF document text
    • http://momesesewoja.rf.gd/12179932923.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_off0000e0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BA 5460 bytes
SHA-256: 27d6b7399e606cbb9059abc328eb51c826c6c05efbaf5179373f566457b467a0
font_01_sfnt_off0000f34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 11100 bytes
SHA-256: 4c05d8648b7c039a448d46f16aa6a03988229aa0111ea994d53adc59eedce731

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