Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29d23a9f7c238e4…

MALICIOUS

PDF

71.8 KB Created: 2021-02-18 22:56:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 01192aad483e9eca8d1cdef78110aacd SHA-1: ff33f8d08da2f8cae9be88aa1770b1f031c391aa SHA-256: c29d23a9f7c238e49f07f761113e149eb32011190311ffacdd3f4844b11e79e3
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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/strik?utm_term=convertir+de+6+pulgadas+a+mm In PDF document text
    • https://labufixurugon.weebly.com/uploads/1/3/4/8/134873424/012e1bb0e53.pdfIn PDF document text
    • https://ruvawuwejijexut.weebly.com/uploads/1/3/0/8/130814193/1634508.pdfIn PDF document text
    • https://nodokesomizi.weebly.com/uploads/1/3/4/6/134656280/256d2.pdfIn PDF document text
    • https://vabinori.weebly.com/uploads/1/3/4/3/134348027/117acc.pdfIn PDF document text
    • https://cdn.sqhk.co/tatudawo/FrijEhi/zosatu.pdfIn PDF document text
    • https://jomupalekiloja.weebly.com/uploads/1/3/4/3/134310494/8619538.pdfIn PDF document text
    • https://jumifusat.weebly.com/uploads/1/3/4/6/134629025/wifopijagawasu.pdfIn PDF document text
    • https://zanugikujo.weebly.com/uploads/1/3/4/3/134399251/c054f4d43.pdfIn PDF document text
    • https://tumozoredupoki.weebly.com/uploads/1/3/0/9/130969837/mubaju_bidisopibo_nizarep_pasidizakaleku.pdfIn PDF document text
    • https://cdn.sqhk.co/votezevon/hyhgJgI/lollipop_chainsaw_zed_theme.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sinadi/wikazopumos.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/teludijewobixupizotova.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/us_navy_primary_flight_training_aircraft.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/integration_of_x_into_cos_inverse_x_dx.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/jobojuxaxadi.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/9024116010.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/hypothalamic_amenorrhea.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/wiwiwobu.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_off0000d78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78C 5396 bytes
SHA-256: 3c5334196eec710d8e96b2cd3d8f81bd08323f894a9fe0a0057b55ff69e1c21c
font_01_sfnt_off0000e9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D6 11844 bytes
SHA-256: c1442437108c726b6ac569a5fa243fd55150b8e1a8bf80a107e6ace0b9134df0

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