Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4ddee78074eca3…

MALICIOUS

PDF

72.3 KB Created: 2021-02-15 20:31:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e30cc615316badc4c4bab80dd7b5866b SHA-1: 1130ab2c32762f22a4ffd459bef1178311f5ef8b SHA-256: 2b4ddee78074eca32d3324824d2831dc7f0aef14ade9e17f2a6298ca3f6d5a56
186 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 a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded URL 'https://leonvi.ru/wb?keyword=define%20scientific%20theory%20in%20a%20sentence' likely serves as a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/wb?keyword=define%20scientific%20theory%20in%20a%20sentence PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385217/normal_5fd679a63a880.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/fhdhdkq/bofepedobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392864/normal_600f60f79e79b.pdfIn PDF document text
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/4ab7d479.pdfIn PDF document text
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/nefuf.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/cHDVDih/virtual_piano_lessons.pdfIn PDF document text
    • https://dupomosukafe.weebly.com/uploads/1/3/5/3/135387566/2d1678a4e.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/FTjcjfn/coffin_dance_meme_piano_sheet_music_easy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373770/normal_5fed953120718.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/ghijCja/didion.pdfIn PDF document text
    • https://cdn.sqhk.co/ledumixifer/isgdigU/university_of_montana_athletics_jobs.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/iejcwPd/nateponuvolubopis.pdfIn PDF document text
    • https://nixabuvibowigev.weebly.com/uploads/1/3/4/3/134308208/bujugag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/57437568883.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/wixexod.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/4201171339.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_off0000dbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE9 5036 bytes
SHA-256: 29e7ec47333576aeac35396cd334d38411854574f1d5497fe633f38db93b0b7b
font_01_sfnt_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 11576 bytes
SHA-256: e9d16eab2c2f154bcdf8dfb1723a6ebb2be1100b465e27f6696cd728744dbe9a

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