Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b7ec06e8b5d904…

MALICIOUS

PDF

68.3 KB Created: 2020-12-06 12:41:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 99e88f79436f8d73e187e7eb30258387 SHA-1: 928219d13c52720fe7c20bb413fe2fca7a95e599 SHA-256: 27b7ec06e8b5d904d558532fd6da149ffe60f13aa57563de770469dde4c843b8
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://trafficel.ru/123?utm_term=black+clover+leopold+x+reader+lemon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385635/normal_5fa9ca62b18cb.pdfIn PDF document text
    • https://sopopubepomexak.weebly.com/uploads/1/3/4/2/134265445/lasobegibito.pdfIn PDF document text
    • https://watoniworawi.weebly.com/uploads/1/3/4/8/134871767/c162a.pdfIn PDF document text
    • https://tumipipap.weebly.com/uploads/1/3/4/5/134598024/daecd9d7.pdfIn PDF document text
    • https://davobudo.weebly.com/uploads/1/3/4/4/134432622/fojefexibin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375518/normal_5fa688091be4b.pdfIn PDF document text
    • https://mivopolidenez.weebly.com/uploads/1/3/4/3/134349928/e6858f896.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/1384190a-1b74-43f8-8cb2-ecfc69d01f77/13222769008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfecc56b-ba7d-4568-9a0b-a04cfb320e0d/12605687230.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/15687226687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c9c49b0-1941-484a-83d8-6bef63ca34ce/words_that_start_with_the_suffix_pre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7581b70f-4b4e-4efd-bc1f-478fb61ce891/tixedabemedavosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2505a513-aa25-42d0-a113-6f670bb9d6ce/kufibojetezenojom.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc586961c8c741314515584/t/5fcc6f695d2e6f3bda34e622/1607233386110/drive_appeal_new_hope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f031adc-1e0e-44b3-8f70-b1bb917e600e/ronunu.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/30060468611.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_off0000d0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DD 5284 bytes
SHA-256: a220140285d0c2a093bf3d3d69a047e5dd1d2970d5a17001e8bf331f43d072f4
font_01_sfnt_off0000e2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 9704 bytes
SHA-256: 9d484c10f50991a6ecb23c1867e4a8794881091b3270725ffa9c711cdac302ce

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