Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb4d896efb795a4…

MALICIOUS

PDF

81.8 KB Created: 2021-06-04 22:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5c8d9dcd7f087dbc237bcaad0a89add1 SHA-1: b082b7d0758c5cf44d4315cd110db163c32f7a58 SHA-256: 8eb4d896efb795a4d72c2744e3e1678f30efaa9ea3e73091d8eeb6ba95b54f81
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, appears to be related to font downloads, which is likely a lure to direct users to these malicious or suspicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/123?utm_term=bauhaus+95+font+free PDF link annotation
    • https://kekulewu.weebly.com/uploads/1/3/4/3/134398637/47a4f34384.pdfIn PDF document text
    • https://gixorinimomavam.weebly.com/uploads/1/3/2/6/132695995/5757025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375356/normal_5fd63494acf3a.pdfIn PDF document text
    • https://gadetuzajuvi.weebly.com/uploads/1/3/4/8/134850054/gezigojin_zefonanufupagan_ligotiru_jumavajuge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463824/normal_6050e971e4ff6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473049/normal_600fbf6d48d22.pdfIn PDF document text
    • https://wipowoniwosixad.weebly.com/uploads/1/3/0/7/130740259/4cc4e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_6043572ea0848.pdfIn PDF document text
    • https://winokagadav.weebly.com/uploads/1/3/2/7/132740598/1253654.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480589/normal_5fce61cc43c2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481173/normal_6013f358d9ded.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4490371/normal_60b25df345866.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464083/normal_5febc256e33f8.pdfIn PDF document text
    • https://kuduxefu.weebly.com/uploads/1/3/2/6/132695679/vezuravufop.pdfIn PDF document text
    • https://somigoduwus.weebly.com/uploads/1/3/4/4/134470899/vesegagu-zijijodakona.pdfIn PDF document text
    • https://dejoputaxili.weebly.com/uploads/1/3/4/7/134763817/duwovevefanibeluzug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziludezubeju.pbworks.com/w/file/fetch/144607848/why_wont_my_hamilton_beach_flexbrew_work.pdfIn PDF document text
    • http://dobifapig.pbworks.com/w/file/fetch/144449184/68087773829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d05d9a62-6462-4ccd-b1ed-cb2cead7234c/19479394267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae5297c-fe03-45f0-b001-15cb5324d5e8/dyson_dc39_stops_spinning.pdfIn PDF document text
    • http://wixugigir.pbworks.com/f/8036217325.pdfIn PDF document text
    • http://tozuxexap.pbworks.com/w/file/fetch/144525390/the_curious_researcher_a_guide_to_writing_research_papers_8th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2310377d-a4e2-4a6d-8f8c-750ef056f834/51894500326.pdfIn PDF document text
    • http://xalanupuzewo.pbworks.com/f/realidades_1_capitulo_3a_answers_page_50.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d9dac41-2268-4b7f-907b-f489060cb7f9/vadonuv.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_off0001018c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018C 5152 bytes
SHA-256: 01ec9da3584ec5d0954405675c014dd1fecdecd70c3cfe0bca66d842d700cee2
font_01_sfnt_off0001130e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130E 10924 bytes
SHA-256: 48ef849364f90a8bba8fb9b9922d35c1d3eec05d295d6c7dc1294f4978b5a3dd

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