Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b0203ce9605c12…

MALICIOUS

PDF

73.1 KB Created: 2021-06-13 11:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 68006864b4045d31e17b610e3b40675a SHA-1: 6684d950b29fddef700ed180949df53f371f8f42 SHA-256: d3b0203ce9605c12825dc7ea74f437dcd9393c287f264036c9b34b1ad07efa96
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for SEO manipulation or to redirect users to malicious sites. The embedded URLs, such as 'https://smidgel.ru/pbw?utm_term=free+games+to+play+like+minecraft', are likely part of this scheme to drive traffic to potentially harmful content.

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://smidgel.ru/pbw?utm_term=free+games+to+play+like+minecraft PDF link annotation
    • https://zorelivuveromip.weebly.com/uploads/1/3/4/4/134438733/4117360.pdfIn PDF document text
    • https://lefevelomisowub.weebly.com/uploads/1/3/4/4/134459897/wamisuwuze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450354/normal_6030150b40221.pdfIn PDF document text
    • https://fewadagagex.weebly.com/uploads/1/3/4/5/134594838/6bba4c1db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444882/normal_600c98ab3e715.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370777/normal_5ffd6ab890aae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449771/normal_60392c8442faa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412151/normal_5fe4e0aeaaf73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414515/normal_60c12ed1c0f74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490961/normal_6049cfb57103d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411511/normal_6032d0f92c57a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378167/normal_60bcefce0f058.pdfIn PDF document text
    • https://xavebebojemap.weebly.com/uploads/1/3/4/8/134848852/bee603b7c39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiduxikuve.pbworks.com/w/file/fetch/144423480/macbeth_act_4_scene_3_stylistic_devices.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/f/66616416935.pdfIn PDF document text
    • http://lufokomarib.pbworks.com/f/xawexitomut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0e03a97-70c1-4ecc-af6c-ef97d9db1a3a/96361398065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8e20d16-1295-4de8-9760-ed473392cd38/rusoxebasamoxu.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_off0000e0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FD 5456 bytes
SHA-256: d3bbe739fd059a87068179cdcb8659f7e7ac5e1ea1098ff885b968f951bcdad2
font_01_sfnt_off0000f38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 10504 bytes
SHA-256: f9c25886658b8f1850c362e44145229fb8c13e4e9f8170b93b9b47615acd747b

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