Malicious PDF — malware analysis report

Static analysis result for SHA-256 985d1ed8c4e177b5…

MALICIOUS

PDF

77.8 KB Created: 2021-02-19 04:18:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c5d6a426b78e26b6a426361b627448fc SHA-1: 578371f5c2480ddfb463c992a3cef35ec48ff98e SHA-256: 985d1ed8c4e177b56ecf9211650eddd2b6d6c0ca6e05a3824e8e3cf8f42cae15
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary external URL, 'https://jacksth.ru/wix?keyword=constantly+risking+absurdity', suggests a phishing or malicious redirection attempt. While no scripts were explicitly extracted, the presence of numerous external links and the ML classifier's high confidence score indicate a malicious intent, likely related to phishing or malware distribution.

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=constantly+risking+absurdity PDF link annotation
    • http://mklhhhh.space/921991678309329c.pdfIn PDF document text
    • https://cdn.sqhk.co/tizudukokeni/VheIoPI/69227902644.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480744/normal_60135c0c15575.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/ijhcifp/multi-_multiple_accounts_app_for_android.pdfIn PDF document text
    • http://rubisteq.online/60765009079jteog.pdfIn PDF document text
    • https://pexulowiseguwuz.weebly.com/uploads/1/3/4/3/134391342/bumejisabi_bomedagefulojag.pdfIn PDF document text
    • https://wufisosudima.weebly.com/uploads/1/3/0/8/130874090/3201100.pdfIn PDF document text
    • http://good-production17.site/85881337282qi98a.pdfIn PDF document text
    • https://zowotojezef.weebly.com/uploads/1/3/4/3/134330732/c3845f8eb07.pdfIn PDF document text
    • https://poxigupi.weebly.com/uploads/1/3/1/3/131398264/21f4442f9224e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467027/normal_5fcff7d570852.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489045/normal_5fd9e8e617c78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465559/normal_5fd86d5535391.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/luramamelolem/toxivumusudedejujujuxosin.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/mokekipugos.pdfIn PDF document text
    • http://bodudubabafixe.rf.gd/nobreak_apc_ups_600_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/groovy_scripting_reference_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/what_did_the_martian_say_when_he_accidentally_landed_on_venus_answer_key_math.pdfIn PDF document text
    • http://sifuzetijo.rf.gd/39414702835.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_off0000f31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31C 5204 bytes
SHA-256: b2ac16577d7bcdc0c907b0ebc0c385ebe7b3ca51d0c99c99b065cfc2cf83b144
font_01_sfnt_off000104e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E3 10780 bytes
SHA-256: 64e9f093209df119c5766b338fbab5e8fd71935edfbd8e63da95b5785b3454d5

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