Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86b0c989ca5d316…

MALICIOUS

PDF

82.6 KB Created: 2021-04-07 22:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 923900cba687463218a08d1f4652601d SHA-1: 56597b1fe619a6da64ecdb945165e752bd4414e8 SHA-256: a86b0c989ca5d316ec6ed7b06f412292dab9143d92d138c9b7434ec1d6d48993
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-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://seumenha.ru/123?utm_term=film+band+of+brothers+season+2 PDF link annotation
    • https://rixowumunek.weebly.com/uploads/1/3/5/3/135330445/3856031.pdfIn PDF document text
    • https://dirotigakavomak.weebly.com/uploads/1/3/4/2/134235834/f07eaf68ba28f.pdfIn PDF document text
    • https://pugulabojoxo.weebly.com/uploads/1/3/5/9/135993792/lixoneliwuvin.pdfIn PDF document text
    • http://eliyalte.com/yamaha_mg20xu_mixing_console4rxr0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481411/normal_5fc6b4937f7b0.pdfIn PDF document text
    • https://raralulewuk.weebly.com/uploads/1/3/4/4/134478892/toxejosu.pdfIn PDF document text
    • http://itfamily.pro/58151367134kszvx.pdfIn PDF document text
    • https://pudoxarunisit.weebly.com/uploads/1/3/1/1/131164251/visoxologo-kawutov-xefubada-telolifusox.pdfIn PDF document text
    • http://gupilan.iblogger.org/47244938141.pdfIn PDF document text
    • http://itash.space/edipo_rey_completo_descargarzm2yv.pdfIn PDF document text
    • https://sagojuxejuzogug.weebly.com/uploads/1/3/4/5/134598596/3d92784d22.pdfIn PDF document text
    • http://copyrighytsupport.com/21530255823ul81x.pdfIn PDF document text
    • https://dobivevoxopu.weebly.com/uploads/1/3/1/4/131453544/5341940.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471467/normal_5ffe5a3d29f5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ac911ccd-a574-46a9-bbb3-57bb927ff796.filesusr.com/ugd/2735c9_0a0a82f31a8d46d08db58e08942984e7.pdf?index=trueIn PDF document text
    • https://2c91b947-1dd8-401e-ae91-d595f2f75867.filesusr.com/ugd/0af078_1d27c5842e164737926ebac7b81ee245.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_b34543236a4741c190460f1142aec340.pdf?index=trueIn PDF document text
    • http://sevejegizala.rf.gd/reading_and_writing_grade_11_download.pdfIn PDF document text
    • https://90138cf2-752b-46b9-a396-1872e0473e42.filesusr.com/ugd/02203e_6249cae7e59048f7b83851e0abcb1175.pdf?index=trueIn 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_off000104af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AF 5376 bytes
SHA-256: cac07757bc4a21a5dfcb6201969f5338b2ebf162712f1beca9d6e02d4643fd49
font_01_sfnt_off000116ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CA 11212 bytes
SHA-256: 758a2debfc7fb3f4567b98f2ba84310adf040acc8cdac17a5bde807b1151f911

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