Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f623c5aef486b2…

MALICIOUS

PDF

73.5 KB Created: 2021-02-21 04:00:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: d1708092758714e3ba0dc4bad63b93c9 SHA-1: 13dcd20cf4ec735dc89c0d642b3053d301a99e6c SHA-256: 54f623c5aef486b29445174bf930953a31e602330b7e41436f278bde9315457f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a mass external link farm, with one prominent URL pointing to 'https://seumenha.ru/strik?utm_term=best+course+for+machine+learning+in+python+quora'. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document's content is designed to trick users into believing there are new or changed bank instructions, a common tactic in business email compromise attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://seumenha.ru/strik?utm_term=best+course+for+machine+learning+in+python+quora PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477913/normal_5fd2469ec23e0.pdfIn PDF document text
    • https://kixifosesezor.weebly.com/uploads/1/3/3/9/133998007/b187d2818e97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387412/normal_5ff67cea23e9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407318/normal_5fe0988caa490.pdfIn PDF document text
    • http://gitutemove.iblogger.org/15181307768.pdfIn PDF document text
    • https://wawanuxofidote.weebly.com/uploads/1/3/0/7/130775818/neludepo-jimus.pdfIn PDF document text
    • https://pumazamobu.weebly.com/uploads/1/3/0/8/130874095/jenavakidove.pdfIn PDF document text
    • https://popetebebulexu.weebly.com/uploads/1/3/4/3/134316921/fegokezoxiwuze-kikodeso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413223/normal_5ffc39b6a316f.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/lumixi/xazivimiperopijilerobipi.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/oxidation-_reduction_activity_series_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/44230890222.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/gemivebod.pdfIn PDF document text
    • http://jabowedufup.epizy.com/viberar.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/gokowepubegudop.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_off0000e34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34A 5708 bytes
SHA-256: 35ba46cddbd15ebac6a5e8eeb53c0d6f491d2d0b0874f99095324f34aed6aea7
font_01_sfnt_off0000f694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF694 10016 bytes
SHA-256: b38fd375c77131081df79f201ead07637ae0b10524b6770cffca1229b756e8a7

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