Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d141fc4aa171207…

MALICIOUS

PDF

75.5 KB Created: 2021-02-10 19:27:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fa4f594d8922f9f98547ebaa64a75da2 SHA-1: f560c68a03b52afaecdde93029f7ac89bd8f1c6a SHA-256: 2d141fc4aa171207daf983d0f6e8785525c8a8da2a1b6d2312648c16fd2f4529
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, many of which point to known malicious redirectors or link farms designed to host further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to "color by number app" and "wkhtmltopdf", suggesting a lure to disguise the malicious links.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yafferge.ru/123?utm_term=color+by+number+app In PDF document text
    • https://static.s123-cdn-static.com/uploads/4379611/normal_5ff4889c4de7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459323/normal_5ff5db4e7d436.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393356/normal_6005c63257e09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369764/normal_5fc9b4249ed3a.pdfIn PDF document text
    • https://sukorason.weebly.com/uploads/1/3/4/5/134578332/jadubokosivax-pujizoxatex-juxobedixuxusi.pdfIn PDF document text
    • https://delovamubikener.weebly.com/uploads/1/3/4/7/134707073/2973597.pdfIn PDF document text
    • http://setofexperience.site/download_the_farm_sassy_princess_mod_apkkxxdv.pdfIn PDF document text
    • http://expressday.online/legufubimilomibudonid6e0rk.pdfIn PDF document text
    • http://legendbilisim.com/kejaduwovidilewobeuyb1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485308/normal_5fcdc68f3b519.pdfIn PDF document text
    • https://jemiwuwavaza.weebly.com/uploads/1/3/0/8/130814288/xaworola.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500425/normal_5fc57313b62f8.pdfIn PDF document text
    • http://bet-info.ru/lista_cdf_hd_m3uibzi4.pdfIn PDF document text
    • http://crawlmqyu.space/zexizewuwexisuzq8p4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383136/normal_5febb298061ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suzawelo.epizy.com/84945990883.pdfIn PDF document text
    • http://gekazez.epizy.com/nela_ticket_songs_now.pdfIn PDF document text
    • http://ferenekukosazu.epizy.com/long_division_worksheets_grade_3.pdfIn PDF document text
    • http://marivugedada.epizy.com/american_music_awards_2018_best_performers.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_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 4936 bytes
SHA-256: 27ae48087dd8bec105907df0218a73c6631136c6ef930df8acd40e04e5dfc3de
font_01_sfnt_off0000faf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF7 11408 bytes
SHA-256: 7d42f498224d0b6eb133abf93ce28d02de384335b31414bdf051b38b28e0df87

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