Malicious PDF — malware analysis report

Static analysis result for SHA-256 57145bdfa5e8c256…

MALICIOUS

PDF

89.8 KB Created: 2021-02-19 00:21:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 96dc2bce25bf63de73dd211ae883fbcb SHA-1: 3bdf431f83e02977dc620cb6b540f25b599cee3f SHA-256: 57145bdfa5e8c256640a18f88c9ec98785e4e711cf73981c6b457a6b29b70edc
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to known malicious redirectors or link farms. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong intent to direct users to potentially harmful sites. The ML classifier and ClamAV detection further support the malicious nature of this document, likely used as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=what+do+mandate+of+heaven+mean In PDF document text
    • http://osthondroz.com/axminster_perform_ccnp_planer_thicknesserdx8d9.pdfIn PDF document text
    • http://alexsaf.ru/2968170173722pvo.pdfIn PDF document text
    • http://trikolor.site/raxebuwaxj7fk4.pdfIn PDF document text
    • https://siripikefax.weebly.com/uploads/1/3/4/1/134109310/5196576.pdfIn PDF document text
    • http://qupieasy.online/best_replica_lightsaber_everf24w3.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/geraromu/wutiredamotakapiduno.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/comcast_email_not_sending_android.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/3914483526.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/anesthesia_secrets_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/forms_of_id_for_employment_in_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/tamasha_movie_yts.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/mofawutepagurarumepuzami.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/1972357247.pdfIn PDF document text
    • http://zogivumomu.epizy.com/avicenne_energy.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/tebivuji.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/66983752312.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001129b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129B 4496 bytes
SHA-256: e21845dec54a61a6795902d0150a85d4a83ca12a1ae5c27273a9f7ce2169672f
font_01_sfnt_off0001227f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227F 4916 bytes
SHA-256: bb43ee3a51b82098e3cd087276ee6c49273cdd4817d940563e934cf785062e51
font_02_sfnt_off00013328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13328 11844 bytes
SHA-256: dbf980164f383c70a098b07a257c76a153c356093b448108692189872849a40a

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