Malicious PDF — malware analysis report

Static analysis result for SHA-256 862ba47b4998e400…

MALICIOUS

PDF

74.0 KB Created: 2021-02-19 23:20:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 1f986a7e73c2fa774f83811aad15fe8e SHA-1: d3378c78c6eaa154fd777d897c8b00db99be1335 SHA-256: 862ba47b4998e400ee1cb9731b6100a98aeab899c91338afe9b19d2ef1867067
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, including a link farm heuristic, suggests a phishing or SEO spamming campaign. Although no scripts were explicitly extracted, the PDF structure and external links point towards a malicious document designed to redirect users to potentially harmful content.

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://jottigo.ru/wix?keyword=subway+surfers+cheat+codes+apk PDF link annotation
    • http://keligekixebar.22web.org/ziparenajitiwol.pdfIn PDF document text
    • http://clipshd.design/80316900903urawb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460255/normal_5fccd2b947c99.pdfIn PDF document text
    • https://senamevab.weebly.com/uploads/1/3/4/6/134689233/wazoxerisumo_kokajabizome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385004/normal_5fd7ecbde5ee3.pdfIn PDF document text
    • https://gojulujowavid.weebly.com/uploads/1/3/4/8/134886085/2535a678258580.pdfIn PDF document text
    • https://kodetinerimaguw.weebly.com/uploads/1/3/5/3/135347088/5924175.pdfIn PDF document text
    • http://zinuvudoliku.iblogger.org/credit_note_template_invoice.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5fdb594d17b62.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/folexapurilowe/89556415025.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/bowuzofa.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/xujut.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/relative_clause_worksheet_year_6.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/35766116549.pdfIn PDF document text
    • http://fasilew.epizy.com/20055569381.pdfIn PDF document text
    • http://japonovatiner.rf.gd/gasuxezeguxo.pdfIn PDF document text
    • http://xavisijividefo.epizy.com/47239259057.pdfIn PDF document text
    • http://vuzujalaj.epizy.com/chameleon_run_android_polska.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_off0000c481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC481 8324 bytes
SHA-256: 9ab4645fb3e4e8581615ce9b91d8d5da3aba49a6c774437f621f7a1d5aaa09c0
font_01_sfnt_off0000e059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE059 5712 bytes
SHA-256: 91d590668fa60cdade00b41f59e7770e28193ce7c359aa382a90f9b0a359ce75
font_02_sfnt_off0000f3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DD 12044 bytes
SHA-256: 38062712990bf202b5f47540a0b0aabfd59d94902a002c53dba8bda6fbbfe526

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