Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee28e0208c3f220f…

MALICIOUS

PDF

70.7 KB Created: 2021-02-17 10:58:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 46bba80c56a6b3e082cd5d29c89be105 SHA-1: a53134efe9ae95bd64217dad3d5a3e2bedae6d0c SHA-256: ee28e0208c3f220f713d514fe40c8b6be9fc69ae9d7a2613aba4094f3e4c9029
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. No scripts were extracted, but the document's structure and embedded URLs suggest it functions as a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=diccionario+enciclop%25C3%25A9dico+b%25C3%25ADblico+ilustrado+editorial+clie+pdf In PDF document text
    • http://zazubabifuwor.iblogger.org/24952079147.pdfIn PDF document text
    • https://lokawinopigu.weebly.com/uploads/1/3/2/7/132712062/4088130.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369769/normal_5fdc6130cc025.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzufoxo/hb43jhg/36238467321.pdfIn PDF document text
    • https://cdn.sqhk.co/turomixo/jiJA1Om/43793808566.pdfIn PDF document text
    • https://tasepatoravolun.weebly.com/uploads/1/3/4/3/134352318/6784493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497697/normal_5fe709bd2a2f6.pdfIn PDF document text
    • http://luvetikemo.66ghz.com/42541813454.pdfIn PDF document text
    • https://nukofagola.weebly.com/uploads/1/3/4/8/134883999/porek.pdfIn PDF document text
    • https://cdn.sqhk.co/julubesaf/0ibQhhr/tuxixuluzisozowivig.pdfIn PDF document text
    • https://cdn.sqhk.co/goxoxasopus/ioiizgg/pakistani_chat_room_chardonnay_2018.pdfIn PDF document text
    • https://zexirajeroluwub.weebly.com/uploads/1/3/4/8/134848753/ce7ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tinanatibora.rf.gd/lobenogifiziwiba.pdfIn PDF document text
    • http://bifajone.rf.gd/balanitis_candida.pdfIn PDF document text
    • http://newewixojarulup.epizy.com/walter_chilambo_songs.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_off0000d294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD294 5484 bytes
SHA-256: cb27fb280444f41c32eead870b4b5ca2599e16685aa891fb2151fd810edf64fb
font_01_sfnt_off0000e4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FC 11632 bytes
SHA-256: 3c56a507f1857d8c1f0a501a8b61cdcf2b4f313c86c7894e1ad271481d24c586

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