Malicious PDF — malware analysis report

Static analysis result for SHA-256 6812e15b48361727…

MALICIOUS

PDF

74.0 KB Created: 2021-02-22 14:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e428bf4f254290421f62890854088e87 SHA-1: 9ed4c269a16f82ccc4134a52eec4637b7de83346 SHA-256: 6812e15b483617279e91d59dd68f923172282bef72b086a734263b77e54a3a3f
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jacksth.ru/wix?keyword=catharsis+in+a+short+sentence PDF link annotation
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/a636180ae.pdfIn PDF document text
    • http://pigopivelar.iblogger.org/wigipisasajowagimamow.pdfIn PDF document text
    • https://vuzanodunujow.weebly.com/uploads/1/3/5/3/135350892/9189930.pdfIn PDF document text
    • https://masagefila.weebly.com/uploads/1/3/4/5/134505888/wopove-gufirukubufux-rujotajer.pdfIn PDF document text
    • http://tijijosopake.22web.org/vakesasemukijaredologi.pdfIn PDF document text
    • https://gitiritibew.weebly.com/uploads/1/3/1/4/131483488/kepidevorugak_rakafoji_sozedaz.pdfIn PDF document text
    • https://tajerupabud.weebly.com/uploads/1/3/1/1/131164315/441e11849ce8c.pdfIn PDF document text
    • https://kofovozeregom.weebly.com/uploads/1/3/4/3/134313602/633ba1614de9b.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/paxunu/lopuwosubojugujelojezama.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/moxure.pdfIn PDF document text
    • http://relamelekubapan.epizy.com/3933647910.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/niwofunisugawidejepizusep.pdfIn PDF document text
    • http://wiwazisumi.rf.gd/how_to_get_rid_of_eczema_through_diet.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/king_size_cotton_bed_sheets_online.pdfIn PDF document text
    • http://pixoriwabivonol.rf.gd/gamitojoderizuwo.pdfIn PDF document text
    • http://worizekadi.epizy.com/illegal_websites_to_free_ebooks.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/sample_renunciation_certificate_form_india.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/healthy_food_guide_october_2019.pdfIn PDF document text
    • http://sodebaxekigefip.rf.gd/starbucks_corporate_social_responsibility_report_2018.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_off0000e7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 4760 bytes
SHA-256: 5ce1fc7aa7be54e1c025651b47148744bd5bbc0a33467053e2fa12d9d93099ff
font_01_sfnt_off0000f7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E2 10328 bytes
SHA-256: 2f500a47d7ac7a0317c70484e8024a34a0be7616e2094fc94989540fcf57a4f0

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