Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23d6f2e4c6fad5f…

MALICIOUS

PDF

71.0 KB Created: 2020-11-18 04:22:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 60e8e37e4b326669bc9ef569c47864e6 SHA-1: 162a6660c128a41970bec7cbd991a952c4811269 SHA-256: e23d6f2e4c6fad5ff2fc7cde0d3528c8b301acab2a03aa2628c8f4cb84bc5eef
186 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 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://traffking.ru/aws?utm_term=sample+quote+templates PDF link annotation
    • https://wawukonuxoni.weebly.com/uploads/1/3/4/0/134095992/wepomibu_lelumumax_lixise.pdfIn PDF document text
    • https://bupebilonozopi.weebly.com/uploads/1/3/4/8/134861312/sobumi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_5f9d479f01daf.pdfIn PDF document text
    • https://sopulekazixov.weebly.com/uploads/1/3/0/7/130776801/8265577.pdfIn PDF document text
    • https://vigaziwow.weebly.com/uploads/1/3/4/3/134322068/3fb35a29b79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373776/normal_5f8b7d77a3a8e.pdfIn PDF document text
    • https://pulepuvoko.weebly.com/uploads/1/3/4/2/134266128/b04855be47a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373986/normal_5f90d786476a6.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/c03132c1-da15-421d-aa9b-4cb66b6c6a23/juwexaxifodizora.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/frigidaire_5000_btu_portable_air_conditioner_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d61e199-b6e9-4d6d-9614-ae78147a7402/99576324329.pdfIn PDF document text
    • https://s3.amazonaws.com/mupuraregonu/scott_elementary_school_salem_oregon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bfbfb3a-c903-4554-9088-e74332851b36/77519228309.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09e6786a-772a-4ce3-bc20-2b9732fff861/are_electrons_fast_moving_particles.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_off0000da0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0F 5100 bytes
SHA-256: 6675737979b67cd179baa72548b17dcc86f7e7180ceadbd836a31b565051bb82
font_01_sfnt_off0000eb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB56 10664 bytes
SHA-256: 4052dd75ccbabb7c8a927fa8bd4e396a698dc39291f26be496921d3cff7592fe

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