Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b100ef27b97071d…

MALICIOUS

PDF

79.3 KB Created: 2021-02-15 12:28:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a46b21c0dc067a36ec8acd1caa17ab5a SHA-1: c8b6d4f54e81bec123a31a963fab0bb75ccb0d67 SHA-256: 4b100ef27b97071d07270ecdbc9c47422a9b8a992133c55fd339d79c4a731582
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL, 'https://crophysi.ru/123?utm_term=washington+dc+weather+forecast+15+days', suggests a lure related to weather forecasts. The presence of numerous Weebly and other hosting service links indicates a likely attempt to distribute malicious content or conduct phishing operations. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/123?utm_term=washington+dc+weather+forecast+15+days PDF link annotation
    • https://remoruputudedux.weebly.com/uploads/1/3/4/0/134017090/f62fae22.pdfIn PDF document text
    • https://lufukosiresefo.weebly.com/uploads/1/3/4/7/134707539/e67d5515d1.pdfIn PDF document text
    • https://cdn.sqhk.co/jupujezaxa/hjggjid/36896255245.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/ignNjbk/srsd_writing_resources.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/6jghfNY/gitazofa.pdfIn PDF document text
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/9ad8624ffc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425235/normal_5fcf3c0835fa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460060/normal_6018a57bf1417.pdfIn PDF document text
    • https://lixezakokigek.weebly.com/uploads/1/3/4/5/134596317/metenotoz.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/tPhaijs/91603283674.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378381/normal_60045aa631ef3.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/wesezuzuvalirik/c_group_railway_form.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/apex_legends_mirage_guide_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/mewebos.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/76688548538.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_off0000f707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF707 5636 bytes
SHA-256: bfaa21381bdec84d99f997881f03c3ea0edd29c75f4f7003ecaa26f12260fc52
font_01_sfnt_off00010a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A55 11340 bytes
SHA-256: 8229634455103170910bce8fdbcac47c7f47c50b7b21868fe7bb1d150b022f5b

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