Malicious PDF — malware analysis report

Static analysis result for SHA-256 3771741108cd443b…

MALICIOUS

PDF

73.3 KB Created: 2021-02-18 13:34:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 62ecd677ae7401bfc21087b890bab16a SHA-1: 0f6c9f03e675f2094f5f27bc61237b56aeb1ef4a SHA-256: 3771741108cd443bc5a4fdf67734f7c8c1131a764889bdbd3d38e3d22cafa8a4
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were extracted, the heuristic firings strongly suggest the document's primary purpose is to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=beehive+english+book+class+9+chapter+1+pdf In PDF document text
    • http://parujom.iblogger.org/suvemukigawivaz.pdfIn PDF document text
    • http://bofinaposo.iblogger.org/bawetemokanuzurevazevuta.pdfIn PDF document text
    • https://gojanaribebiw.weebly.com/uploads/1/3/1/4/131437307/pejana-gijuke-vogorizagiwav.pdfIn PDF document text
    • https://noriledefokotox.weebly.com/uploads/1/3/0/7/130739853/tifujalotakuxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puredaw.rf.gd/org._apache._tools._ant._project_jar.pdfIn PDF document text
    • http://tudutov.rf.gd/6362301717.pdfIn PDF document text
    • http://joxumokuri.epizy.com/critical_ops_kostenlos_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/76358983006.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/66271774748.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/problemas_de_aprendizaje_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/50281968018.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/speak_now_deluxe_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/43947510877.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/zoridi.pdfIn PDF document text
    • http://gasigigi.rf.gd/wakefemed.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/cognos_report_studio_hide_column.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/sasizera.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_off0000d9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FA 5936 bytes
SHA-256: fa6bbab5f34d168f01cc33ce1d2a7ecce93044038a39203af5ea9a106272f742
font_01_sfnt_off0000ee3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3F 11676 bytes
SHA-256: ec3a79153541005a009dbe78fa7d9e3499cb524cd925cd07a3b0da2ac49b5977

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