Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a34fd71ac770bf6…

MALICIOUS

PDF

65.5 KB Created: 2020-12-23 04:21:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 29a3661a2d39d6fb91fd58ad436ae16d SHA-1: 90e077fceab52a83c714209ae84277b4c42a75f8 SHA-256: 6a34fd71ac770bf6d26d2bdfb8b6dedf2edcce7558e3a5b6efac9ff8671f9d31
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://traffset.ru/123?utm_term=chiller+troubleshooting+guide+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484632/normal_5fd36ce9ca976.pdfIn PDF document text
    • https://mujurusema.weebly.com/uploads/1/3/4/8/134846640/a5e7b.pdfIn PDF document text
    • https://togimapobeno.weebly.com/uploads/1/3/4/6/134649298/ximazonanifew-todamufirelal-jufavojifud.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/fepijujonevidi_dowasoriwuxutu_sozevu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379473/normal_5fcf589f65aa4.pdfIn PDF document text
    • https://folanejo.weebly.com/uploads/1/3/0/7/130776558/temolawenetivolodo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc578d79698b02c7f3f914e/t/5fc73f138f0796361576f077/1606893332245/lejixusegitutevoletafumaj.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf52487acac6192ab780d8/1606373960967/nenenadiwinuputi.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/flume_apache_user_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc12ec9f7cf8c75402cc175/t/5fcf219d57846c5b834fba8a/1607410079011/t_mobile_retail_associate_manager_job_description.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc11c78f7cf8c75402c31d1/t/5fd1af6a99fe644e8a5e26e1/1607577451606/lebaran_idul_fitri_2021_jatuh_pada_tanggal_berapa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4f8ee085bf90c0e173f98/t/5fc909fd2170ab5359eab5f0/1607010814138/free_race_car_games_ps4.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6542c8787e8798990eefd/t/5fce23c1cded405bb8015928/1607345090047/infinity_pool_pictures.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_off0000c61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61D 5140 bytes
SHA-256: 832e7f2fa5e1dc562e8becb752723f507c230c4c019cbb640de7f941d37e3c3c
font_01_sfnt_off0000d785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD785 9668 bytes
SHA-256: 7c56818de6b342493814eae8f4f6493e953fecd7b268cd5321227c218af150a1

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