Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b78a1619f1215d3…

MALICIOUS

PDF

78.0 KB Created: 2021-05-26 14:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d221b7a3122f451b282559e02a03283d SHA-1: 52ac9718a5d903372695118faf9e23e66b373d66 SHA-256: 9b78a1619f1215d3b4d57afa5e032f479c918b6af9a2bb79946db5a2d91d16aa
156 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 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
  • 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.
  • 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://jumiwimov.ru/strik?utm_term=how+to+find+someone%2527s+ip+address+on+xbox+one+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421329/normal_60519316694c4.pdfIn PDF document text
    • https://fibimijisu.weebly.com/uploads/1/3/4/4/134461798/kixiwibixajikim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470545/normal_601f20538999e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390383/normal_60319287ba0cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403673/normal_603abec112de1.pdfIn PDF document text
    • https://mobisikude.weebly.com/uploads/1/3/1/6/131606420/wodufoguvikolunuxufe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480162/normal_603bf048bea66.pdfIn PDF document text
    • https://malitizume.weebly.com/uploads/1/3/4/0/134097131/5975671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477910/normal_601a7f3f1828e.pdfIn PDF document text
    • https://xewidepomizexas.weebly.com/uploads/1/3/0/7/130775014/32b998339d3.pdfIn PDF document text
    • https://fivitilanafime.weebly.com/uploads/1/3/5/3/135395402/bezalatifuxubivaremo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_6025cf4e9ee63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489853/normal_5fd790e93c24c.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://uploads.strikinglycdn.com/files/30193802-9e9a-45b3-bdcc-b8b41fc8bb94/how_to_find_the_missing_side_lengths_of_similar_triangles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/615f2662-b13e-4f23-b3d6-059313976c36/tinezozinexadogukitexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32bdf6aa-211e-42b5-9a7c-caac742ebced/27936627784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88ba2b02-bcc7-44c8-915f-60525b2876dd/61120859888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21ae4e01-4916-47cc-9682-8ae7f54126bc/43172578342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3b708bf-c081-46dd-a0de-4e9bedfc97ea/74874368013.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_off0000e6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F4 5512 bytes
SHA-256: ca4fe35053f4cfddb790db35363ff68d54487a7c5e69f0e7fa63e49abe84d07b
font_01_sfnt_off0000f9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 10108 bytes
SHA-256: 66f315a2381d02672b5c10d1939810a44698e0ef54c9e701b080f800dec1c52b
font_02_sfnt_off00011c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C49 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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