Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3dd798e0a8ceae…

MALICIOUS

PDF

69.2 KB Created: 2021-03-13 18:47:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 56bfbaec43c056a17821c75cae1c1383 SHA-1: b02a2de77c054d3f94edf65af6ecb1653da81253 SHA-256: 6d3dd798e0a8ceaeb26096cb92f9fe78f985b4a9066b0850f9cc74b04ba3ba25
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a large number of external links, suggesting it's part of a link farm designed to manipulate search engine results or redirect users to potentially harmful sites. The presence of embedded URLs further supports this, with one pointing to a suspicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/wix?keyword=100+doors+5+level+22 PDF link annotation
    • http://muzolifuvekimew.22web.org/nemesis_safety_glasses_for_sale_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/df9bfcc7-962c-424b-8894-56fd3ff8cb19/how_do_i_know_what_size_grill_cover_i_need.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/action_plan_template_high_school.pdfIn PDF document text
    • http://jatomije.rf.gd/cisco_webex_meetings_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3d236ed-5881-4395-bcb3-893772fb8d81/72216469875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13646602-f9dd-48e8-b9e4-ffd8b35d38b4/how_much_water_to_put_in_rug_doctor.pdfIn PDF document text
    • http://tizavoju.rf.gd/what_are_romantic_elements_in_poetry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b26b52cc-9659-49b4-8fba-b035b5ce1f3e/alpha_phonics_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/poetry_analysis_worksheet_doc.pdfIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_19261064be074532b4eb1cfdb56c9a26.pdf?index=trueIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_b670cd13365342e6af1b7db8c1356fee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b23516c7-c957-4487-8949-7a4bc4d3f8df/the_last_song_movie_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a76c0a5-b00f-4254-9aae-16aff671ecab/what_are_long_uncoiled_strands_of_dna_in_a_cell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e93720a-90d9-49f4-993c-14cbf322a29f/nc_drivers_license_test_signs.pdfIn PDF document text
    • http://verafewema.rf.gd/right_to_equality_article_14_to_18.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52c261e5-008f-48cf-88e8-f77b95d82266/fervent_book.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/gatezawomaxivoropagaxoro.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_off0000d41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41C 5024 bytes
SHA-256: b9d037a72a17040ce5ec310bbf09a90d67dff535659906fe5a53e602fc722c42
font_01_sfnt_off0000e553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 10232 bytes
SHA-256: 583088666792a1e66bab75523484fd94b9ea5184bb35d4af2f269c68c950c307

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