Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc6236084a490d2f…

MALICIOUS

PDF

66.5 KB Created: 2021-02-13 10:47:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 64c460c5be115f784a474b5d00ec74fd SHA-1: f65caa48bffe130a06679e6bc6b9e8d9802be907 SHA-256: cc6236084a490d2fd5a5e1612e5b6e442088f7c181953aa3dc3a1c19c4766989
264 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a malicious document, including a malformed exploit stream and a critical heuristic firing for a malicious redirector link. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://yafferge.ru/wix?keyword=seraphina+livro+pdf In PDF document text
    • http://betmoy56.com/zosuwezidaedaa5.pdfIn PDF document text
    • http://websporizlehd.com/vegenefopikibifert5qj.pdfIn PDF document text
    • http://wivejudotimog.22web.org/al_anon_big_book.pdfIn PDF document text
    • http://unreguezff.rest/583994293803z6g5.pdfIn PDF document text
    • https://jasesinokez.weebly.com/uploads/1/3/1/1/131164090/c4b16e452497fb.pdfIn PDF document text
    • https://boxijobanopuvob.weebly.com/uploads/1/3/0/7/130739783/dabujakujatuvak.pdfIn PDF document text
    • https://dukilasurijase.weebly.com/uploads/1/3/2/8/132815907/wofuvibo.pdfIn PDF document text
    • https://noresewikikizi.weebly.com/uploads/1/3/1/4/131453465/2d3e122ecf.pdfIn PDF document text
    • https://cdn.sqhk.co/vopupevomate/ggYXgis/43152853356.pdfIn PDF document text
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/xufigobifa.pdfIn PDF document text
    • http://brettlockhart.com/fekubejudevawujuxudibomqxc57.pdfIn PDF document text
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/navitenipasoku_sirax_bolobalip_suzepovoforura.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zozusanom.epizy.com/xufufolunutivob.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/86060970617.pdfIn PDF document text
    • http://kidoputuf.epizy.com/37444015298.pdfIn PDF document text
    • http://penisidisipifo.rf.gd/org_chart_with_dotted_line_reporting.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_off0000c7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BD 5116 bytes
SHA-256: 1c55f71406a3a951e879dd8f59b5004a51ce2bcc879646fae5b5cef8dc9f1293
font_01_sfnt_off0000d926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD926 10644 bytes
SHA-256: 19add1686688ca0433eda5804aa3eb3c92399e019dd7e9f964a76c3ceb7c3e2f

Open this report in the interactive analyzer, or submit your own file for analysis.