Malicious PDF — malware analysis report

Static analysis result for SHA-256 429369664c930c4a…

MALICIOUS

PDF

73.9 KB Created: 2021-06-13 17:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4a4e096f1e3ac1e95e8aa48fa3256eee SHA-1: 192dac718e6abda97279ce00c35999307fba305b SHA-256: 429369664c930c4a0aae1806edf86a951302e64b1951cd85c9f620873c98fa7d
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 0.9995

Heuristics 6

  • 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 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://oniceh.ru/pbw?utm_term=english+tenses+test+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369760/normal_603f019cace08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389820/normal_5ff179541d58b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487184/normal_604a4e1c2ef9d.pdfIn PDF document text
    • https://naguruzitu.weebly.com/uploads/1/3/4/3/134369267/5485266.pdfIn PDF document text
    • https://bobujiwa.weebly.com/uploads/1/3/1/0/131070874/wivuja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476427/normal_60527d0964d72.pdfIn PDF document text
    • https://goxutulolikum.weebly.com/uploads/1/3/0/8/130814421/4871763.pdfIn PDF document text
    • https://kexujutexaz.weebly.com/uploads/1/3/1/8/131858540/6f51dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_6046ab1c99773.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413362/normal_6013ca9bf0f16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427795/normal_60bbbfef307a8.pdfIn PDF document text
    • https://lodovanu.weebly.com/uploads/1/3/4/4/134403978/4740914.pdfIn PDF document text
    • https://kobetuditi.weebly.com/uploads/1/3/4/4/134446504/c27c0902.pdfIn PDF document text
    • https://nebunabimumebu.weebly.com/uploads/1/3/4/4/134480995/matopukoze_wepesa_xofujixumezif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421335/normal_60bfbb96615dc.pdfIn PDF document text
    • https://zuziraluxir.weebly.com/uploads/1/3/4/8/134899121/6359194.pdfIn PDF document text
    • https://nuwomanat.weebly.com/uploads/1/3/4/6/134664603/derawoligigitano.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/7a889230-38b2-4c38-862e-edf0396796f9/how_to_activate_a_comcast_cable_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af99728f-b551-47c7-83c2-b0749515a934/94730767220.pdfIn PDF document text
    • http://zironuwivod.pbworks.com/f/98144931029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/def1d6df-f49a-4287-a5c4-e2058036f934/sojipesaxadalo.pdfIn PDF document text
    • http://kibumezi.pbworks.com/f/how_to_get_a_pre_authorized_debit_form.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_off0000e118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 4996 bytes
SHA-256: e5dbb78958316028a8c94b5bd1e92fbce804d9b95ab6eeb48a36071858078d2f
font_01_sfnt_off0000f226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF226 11300 bytes
SHA-256: f0947a38f1672b21854e830a7ece8f2ec0c2b9c394c7a246807f0aef61148212

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