Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b94b88f2697b71b…

MALICIOUS

PDF

65.0 KB Created: 2020-11-14 00:16:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0e9840a9bc85dec0aedb8fd04b8b18f7 SHA-1: 2eb6ee7a689a6614cb79ee9423df0b3a28f78a38 SHA-256: 8b94b88f2697b71b62ecd1d4e4dd42b19a640bbb6a8aaff39b95e44cad467f48
214 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 and routes users through malicious redirector infrastructure. 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=smooth+fitness+treadmill+parts In PDF document text
    • https://vabejodero.weebly.com/uploads/1/3/4/3/134378136/sidizoguwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_5f9217859df24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5f88df999f6f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374522/normal_5f9a37da47bd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408851/normal_5f9fc46f25d19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5fa48d60d9d45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380379/normal_5f8e098699269.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371246/normal_5f9b18727b6f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408588/normal_5f93547343a95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381737/normal_5f9b674ad9985.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_5fab181e6fc88.pdfIn PDF document text
    • https://velotukuzikud.weebly.com/uploads/1/3/4/7/134722024/nutome_perivojamuvoma_veguvosepoluze_jixafukefur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vobuturinivi/2754223351.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/mabixojaxojumilemefepab.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/97743738681.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_off0000b1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EE 5172 bytes
SHA-256: 2ab5282f11301b3a15949e8d3e5722d4e322896d74783cc9c9a817c23421dab7
font_01_sfnt_off0000c34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34E 11420 bytes
SHA-256: 7d7d11d0893af326f0d8884c359efe80dcd7c38eec6963be8e08f24446458955
font_02_sfnt_off0000e8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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