Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f331f9360736114…

MALICIOUS

PDF

78.1 KB Created: 2021-03-20 18:21:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fb25abb7e7a8a405af18ca10aa5978cc SHA-1: c0dd364d57e486a26979411e55bd240e39052c63 SHA-256: 7f331f936073611452838f3ba1ae66c4bc8dada582dfbc56d43f7a1ce23e4d99
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9993

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://crophysi.ru/strik?utm_term=pals+virginia+beach+public+schools PDF link annotation
    • http://afracheat2.xyz/hard_dimensional_analysis_problems_with_answersn6kqy.pdfIn PDF document text
    • https://malavaxun.weebly.com/uploads/1/3/4/0/134018228/e29d0b.pdfIn PDF document text
    • http://milano-moda.space/final_fantasy_xv_ps4_proa9txp.pdfIn PDF document text
    • https://zizujegaduxopur.weebly.com/uploads/1/3/5/9/135972979/duxanu.pdfIn PDF document text
    • https://varijamali.weebly.com/uploads/1/3/1/8/131856150/bufoxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458132/normal_5fd0601b064ae.pdfIn PDF document text
    • https://wawowipibi.weebly.com/uploads/1/3/3/9/133997364/90458c.pdfIn PDF document text
    • http://reduslimitalia-official.website/89497299870x1gz3.pdfIn PDF document text
    • https://gadebalemalun.weebly.com/uploads/1/3/4/4/134443756/futagunimimalutaraw.pdfIn PDF document text
    • https://xazonidunigi.weebly.com/uploads/1/3/4/5/134590253/9134309.pdfIn PDF document text
    • https://kemigaguni.weebly.com/uploads/1/3/1/0/131070112/komukajikujefujoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488314/normal_5ff255a34c160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420924/normal_6015bd6525d61.pdfIn PDF document text
    • https://wamukefak.weebly.com/uploads/1/3/5/3/135324497/basaweg_dojaxajurof_simipekok_sibitawatokike.pdfIn PDF document text
    • https://vumizopefi.weebly.com/uploads/1/3/5/3/135313358/f7884107a05aaa.pdfIn PDF document text
    • http://ag-management.space/nortel_meridian_m7324_phone_manuala7n5a.pdfIn PDF document text
    • https://kabosasano.weebly.com/uploads/1/3/5/3/135398154/lolak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459036/normal_5fc5f782ca79f.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/xumakomowi/fumojun.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/sasarulopadulajul.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/pinamoro.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/division_fractions_word_problems_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/tikugosurigir.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_off0000f2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 5396 bytes
SHA-256: b2977d9ecc3bb9f05428003cee74a72100a34dd479636fc28f14d4afbd53b29f
font_01_sfnt_off00010535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10535 11052 bytes
SHA-256: ae5a3d2e7a40a3f0e1fd26f0c2333f354a6728a9ff6d257feb7339fc8c469309

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