Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca9dce642ff4a06…

MALICIOUS

PDF

81.9 KB Created: 2021-03-10 08:11:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1e10924a7288566d2432768fb9be12b SHA-1: 7d5d7e86acdb307d1ee0cc1eaf31562f2c1cf172 SHA-256: 7ca9dce642ff4a0656e5b5b0e530c8b3b600738146f2a28deacf7fc7c3ff78ae
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO spam or phishing campaigns to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the presence of many external links suggests an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/award?keyword=meilleur+livre+apprendre+anglais+pdf
    • http://tixesikixux.mygamesonline.org/64828524474.pdf
    • https://wajuzetixageg.weebly.com/uploads/1/3/0/9/130969085/2618881.pdf
    • http://new-volosi.ru/12777440445zxscl.pdf
    • https://cdn.sqhk.co/zulatobi/jf7ii3x/shooting_kingman_az.pdf
    • https://befufagu.weebly.com/uploads/1/3/1/3/131384284/3819576.pdf
    • https://diwimiwiwomenen.weebly.com/uploads/1/3/0/9/130969795/6881332.pdf
    • http://tiluvopira.medianewsonline.com/47652441587.pdf
    • https://wajotirege.weebly.com/uploads/1/3/5/3/135306859/jixavulejinaburo.pdf
    • http://moitender.org/66930439891ycjms.pdf
    • http://toolsbestpricemicrometer.site/how_to_trade_bitcoin_youtube2vin4.pdf
    • https://cdn.sqhk.co/doparibi/hbIyjeH/basic_english_grammar_betty_azar_workbook.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_286fc56fea84460e88940031a08cb50c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/28af5c3b-b4c1-4667-9e9a-ad7185f99c8b/wendys_single_cheeseburger_nutrition_facts.pdf
    • https://uploads.strikinglycdn.com/files/730e1518-c23b-4b28-a6a3-4381bb4f7f2f/16236572856.pdf
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_4fcc8d2ba3764d6cb5e96790319c3378.pdf?index=true
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_055ff0b2dca946118b220c83d916f82d.pdf?index=true
    • http://jisunopesaluzi.atwebpages.com/wapoki.pdf
    • http://gixiluvigatekij.atwebpages.com/zewugiroperisupazano.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff8c.bin
137c8b90c8ab530a4f6e19c4f9923fd6a9baabe068893fc310f0c6fbfc533407		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8C 5272 bytes
font_01_sfnt_off000111a4.bin
b13cf8a78ca3e0ebfa9e5742e12e9288185872dab2545533f53151adcf7a91f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111A4 12568 bytes

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