Malicious PDF — malware analysis report

Static analysis result for SHA-256 218a856ba572fc08…

MALICIOUS

PDF

77.3 KB Created: 2020-12-23 21:54:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4e905ef5533c0d23720369bbc3b77d5a SHA-1: 993c943203734678b7b52b3b42b3f9512a47d47c SHA-256: 218a856ba572fc08f693537721740265f178772c409fbba034acf8868797426d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDFs with numeric slugs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://trafficel.ru/wb?keyword=kuroko%20no%20basket%20wallpaper%20phone%20hd PDF link annotation
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/b919b1ed8f.pdfIn PDF document text
    • https://silifasakesi.weebly.com/uploads/1/3/4/5/134510621/gipik-gudaxegataro-fobowugiwu.pdfIn PDF document text
    • https://serofijukepaba.weebly.com/uploads/1/3/4/6/134693026/8861185.pdfIn PDF document text
    • https://piborubaladedos.weebly.com/uploads/1/3/4/7/134764427/4d8608745cb622f.pdfIn PDF document text
    • https://suxugugufagiwa.weebly.com/uploads/1/3/4/7/134740592/7567233.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382190/normal_5fde4d4929ecf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5f8b1b517627d.pdfIn PDF document text
    • https://xawuwotogot.weebly.com/uploads/1/3/2/6/132695388/6d4b79f39c6578e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/batch_manufacturing_record_format_for_tablet.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/ketogene_ernhrung_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/the_biography_of_nelson_mandela.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/neviga.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/xesojepixilomabalu.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF5 3036 bytes
SHA-256: 20b33c743524d4a6df6b1de57ffd39e072af228b800798817873c5b091828069
font_01_sfnt_off0000c9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C7 5312 bytes
SHA-256: 6d83a0c82d27ff995b255f47a5642eb80490d83c1ec28906185e96ff3f691197
font_02_sfnt_off0000dbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 5852 bytes
SHA-256: 4898a065fb0c16b974e9a02d7df6b2166b133689e51422f07b6cdada0fbdb129
font_03_sfnt_off0000ea8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 11372 bytes
SHA-256: f07aa6841d70804aad8acdc3412e8ade03ae742676254b7cf54c96e0f5ea4f79
font_04_sfnt_off00010fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB9 16276 bytes
SHA-256: 9631f23fcfbece631bb3312bf48865ed489448ce057352c62c5f80d52a73e22e

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