Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4c7a0f2aae1820…

MALICIOUS

PDF

62.7 KB Created: 2021-02-11 06:47:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f4bdb2dfb720910e09c93de4576c95b8 SHA-1: 0955c9883375eaa3ed82f3d7e32e00087b727726 SHA-256: dd4c7a0f2aae1820f34fb438d74516e9b7eab045f1d75528a77a5f9100973711
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 0.9998

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://bologen.ru/wb?keyword=calcul%20imc%20formule%20math%C3%A9matique PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413475/normal_5fcb6dbd17d8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417827/normal_60053eed27bc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392209/normal_5fff5c1ad1f1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477369/normal_5fc94db27231c.pdfIn PDF document text
    • http://unreguezff.rest/vikivekordhq1l.pdfIn PDF document text
    • https://bewogataxatux.weebly.com/uploads/1/3/2/6/132695278/vusaxavuvodamudixi.pdfIn PDF document text
    • http://eduha.online/tecumseh_engine_hssk50_repair_manual970fl.pdfIn PDF document text
    • https://guvatezip.weebly.com/uploads/1/3/0/7/130776756/8f7ee32b6386.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/mod_for_minecraft_education_edition2ezz4.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/vavapekadoliti/bujuduruzirikij.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/automower_315x_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/2590237719.pdfIn PDF document text
    • http://lezapogitoda.rf.gd/english_in_biological_science_ian_pearson.pdfIn PDF document text
    • http://mupisogedosido.epizy.com/bsge_hysteroscopy_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/home_construction_costs_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/distance_travelled_app_for_android.pdfIn PDF document text
    • http://xelidamos.epizy.com/69482677003.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/blue_eyes_full_song_mp4.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_off0000b88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88C 5116 bytes
SHA-256: d25ae3fb634d0aea24d07e81f41e4da5d94e3883bbe0fb2187c68436d0f75074
font_01_sfnt_off0000c983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC983 10440 bytes
SHA-256: 9db6796ec2f27f6fda0a1ea65766286de39a7bcda5acb19477cb672583ede45f

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