Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efb505cf5a79a9b…

MALICIOUS

PDF

80.3 KB Created: 2021-03-27 10:50:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 730d88c38d1a3ba2e754f630b67b580b SHA-1: 2c79adcc6e9268793758fa1883d3bd92267232a9 SHA-256: 6efb505cf5a79a9bb271fdb9a262f35867768317cfe6359e5f1dda0d539348c6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://resalured.ru/123?utm_term=free+birdhouse+plans+pdf PDF link annotation
    • http://sk-anker.ru/how_to_use_the_strongs_concordancefkm49.pdfIn PDF document text
    • http://wozutujetotox.iblogger.org/descargar_bein_connect_espaa_apk.pdfIn PDF document text
    • http://foripekomufotir.mypressonline.com/poverty_reduction_programmes_in_nigeria.pdfIn PDF document text
    • http://money-team.site/20598959336vezbi.pdfIn PDF document text
    • http://wovidako.22web.org/how_tall_is_cell_jr.pdfIn PDF document text
    • http://wexoxunesixu.iblogger.org/20297716301.pdfIn PDF document text
    • http://inmyshtangen.xyz/how_to_clean_a_toro_snowblower_carburetor_without_removing_itzfkby.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nulesuli.epizy.com/34764103716.pdfIn PDF document text
    • https://16dc6c2a-32e3-4a69-9eea-5b59d93654f8.filesusr.com/ugd/176c29_7ad5f7d3c936425c9f91c3b70b40e3e6.pdf?index=trueIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_83ee9d8857084896ac13307cd31530d2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/roxawo/301063685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a8d63db-9f34-4818-ac70-c83ea099038a/quality_management_system_template_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e190aa41-a295-436d-80c2-6f5f8d4bce7d/7027969927.pdfIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_7555720992ad4c34a2aee4c26a8ca2eb.pdf?index=trueIn PDF document text
    • http://fajenadiwizowo.atwebpages.com/3981723163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a04a48e7-5df7-48a1-b0e2-4258721e8134/super_mario_bros_2_japanese_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a643adec-58c7-4bda-9085-32a5ca63331a/american_red_cross_first_aid_cpr_aed_instructor_course.pdfIn PDF document text
    • https://s3.amazonaws.com/lazesej/wedding_dresses_pictures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05849229-e296-47dd-b315-10aef5ed8824/what_is_trumotion_120hz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 5224 bytes
SHA-256: 37af40ef9c9fc08d1a31b38e236dd945397a125c06b602172ce5daf56e544dc5
font_01_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00010c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C74 11916 bytes
SHA-256: 8deb52e100636d794bac9ad9bec61538a91a2492cd99e8ae58b59145ceaf9193

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